diff --git a/boot-fx/src/main/java/net/java/html/boot/fx/FXBrowsers.java b/boot-fx/src/main/java/net/java/html/boot/fx/FXBrowsers.java
--- a/boot-fx/src/main/java/net/java/html/boot/fx/FXBrowsers.java
+++ b/boot-fx/src/main/java/net/java/html/boot/fx/FXBrowsers.java
@@ -52,6 +52,8 @@
 import net.java.html.boot.BrowserBuilder;
 import net.java.html.js.JavaScriptBody;
 import org.netbeans.html.boot.fx.AbstractFXPresenter;
+import org.netbeans.html.context.spi.Contexts;
+import org.netbeans.html.context.spi.Contexts.Id;
 
 /** Utility methods to use {@link WebView} and {@link JavaScriptBody} code
  * in existing <em>JavaFX</em> applications.
@@ -82,6 +84,16 @@
      * <p>
      * This method sets {@link WebView#getUserData()} and {@link #runInBrowser(javafx.scene.web.WebView, java.lang.Runnable)}
      * relies on the value. Please don't alter it.
+     * <p>
+     * Since introduction of {@link Id technology identifiers} the 
+     * provided <code>args</code> strings are also passed to the 
+     * {@link BrwsrCtx context} when it is being 
+     * {@link Contexts#newBuilder(java.lang.Object...) created}
+     * and can influence the selection
+     * of available technologies 
+     * (like {@link org.netbeans.html.json.spi.Technology},
+     * {@link org.netbeans.html.json.spi.Transfer} or
+     * {@link org.netbeans.html.json.spi.WSTransfer}).
      * 
      * @param webView the instance of Web View to tweak
      * @param url the URL of the HTML page to load into the view
@@ -94,7 +106,10 @@
         Class<?> onPageLoad, String methodName,
         String... args
     ) {
-        BrowserBuilder.newBrowser(new Load(webView)).
+        Object[] context = new Object[args.length + 1];
+        System.arraycopy(args, 0, context, 1, args.length);
+        context[0] = new Load(webView);
+        BrowserBuilder.newBrowser(context).
             loadPage(url.toExternalForm()).
             loadClass(onPageLoad).
             invoke(methodName, args).
diff --git a/boot/src/main/java/net/java/html/boot/BrowserBuilder.java b/boot/src/main/java/net/java/html/boot/BrowserBuilder.java
--- a/boot/src/main/java/net/java/html/boot/BrowserBuilder.java
+++ b/boot/src/main/java/net/java/html/boot/BrowserBuilder.java
@@ -65,6 +65,7 @@
 import org.netbeans.html.boot.spi.Fn;
 import org.netbeans.html.boot.spi.Fn.Presenter;
 import org.netbeans.html.context.spi.Contexts;
+import org.netbeans.html.context.spi.Contexts.Id;
 import org.netbeans.html.boot.impl.FindResources;
 import org.netbeans.html.boot.impl.FnContext;
 import org.netbeans.html.boot.impl.FnUtils;
@@ -121,6 +122,15 @@
     /** Entry method to obtain a new browser builder. Follow by calling 
      * its instance methods like {@link #loadClass(java.lang.Class)} and
      * {@link #loadPage(java.lang.String)}.
+     * Since introduction of {@link Id technology identifiers} the 
+     * provided <code>context</code> objects are also passed to the 
+     * {@link BrwsrCtx context} when it is being 
+     * {@link Contexts#newBuilder(java.lang.Object...) created}
+     * and can influence the selection
+     * of available technologies 
+     * (like {@link org.netbeans.html.json.spi.Technology},
+     * {@link org.netbeans.html.json.spi.Transfer} or
+     * {@link org.netbeans.html.json.spi.WSTransfer}) by name.
      * 
      * @param context any instances that should be available to the builder -
      *   implementation dependant
@@ -301,7 +311,7 @@
                     if (browserClass != null) {
                         browserClass[0] = newClazz;
                     }
-                    Contexts.Builder cb = Contexts.newBuilder();
+                    Contexts.Builder cb = Contexts.newBuilder(context);
                     if (!Contexts.fillInByProviders(newClazz, cb)) {
                         LOG.log(Level.WARNING, "Using empty technology for {0}", newClazz);
                     }
diff --git a/context/src/main/java/net/java/html/BrwsrCtx.java b/context/src/main/java/net/java/html/BrwsrCtx.java
--- a/context/src/main/java/net/java/html/BrwsrCtx.java
+++ b/context/src/main/java/net/java/html/BrwsrCtx.java
@@ -47,6 +47,7 @@
 import org.netbeans.html.context.impl.CtxAccssr;
 import org.netbeans.html.context.impl.CtxImpl;
 import org.netbeans.html.context.spi.Contexts;
+import org.netbeans.html.context.spi.Contexts.Id;
 
 /** Represents context where the <code>net.java.html.json.Model</code>
  * and other objects
@@ -54,7 +55,12 @@
  * The context is also associated with the actual HTML technology
  * in the HTML page - there is likely to be different context for 
  * <a href="http://knockoutjs.com">knockout.js</a> and different one
- * for <a href="http://angularjs.org">angular</a>.
+ * for <a href="http://angularjs.org">angular</a>. Since version 1.1
+ * the content of contexts can be selected by registering
+ * implementations under specific
+ * {@link Id technology identifiers} and requesting them during 
+ * {@link Contexts#newBuilder(java.lang.Object...) construction} of the
+ * context.
  *
  * @author Jaroslav Tulach
  */
diff --git a/context/src/main/java/org/netbeans/html/context/impl/CtxImpl.java b/context/src/main/java/org/netbeans/html/context/impl/CtxImpl.java
--- a/context/src/main/java/org/netbeans/html/context/impl/CtxImpl.java
+++ b/context/src/main/java/org/netbeans/html/context/impl/CtxImpl.java
@@ -44,8 +44,10 @@
 
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.List;
 import net.java.html.BrwsrCtx;
+import org.netbeans.html.context.spi.Contexts;
 
 /** Implementation detail. Holds list of technologies for particular
  * {@link BrwsrCtx}.
@@ -54,13 +56,15 @@
  */
 public final class CtxImpl {
     private final List<Bind<?>> techs;
+    private final Object[] context;
     
-    public CtxImpl() {
-        techs = new ArrayList<Bind<?>>();
+    public CtxImpl(Object[] context) {
+        this(context, new ArrayList<Bind<?>>());
     }
     
-    private CtxImpl(List<Bind<?>> techs) {
+    private CtxImpl(Object[] context, List<Bind<?>> techs) {
         this.techs = techs;
+        this.context = context;
     }
     
     public static <Tech> Tech find(BrwsrCtx context, Class<Tech> technology) {
@@ -74,9 +78,9 @@
     }
 
     public BrwsrCtx build() {
-        Collections.sort(techs);
+        Collections.sort(techs, new BindCompare());
         final List<Bind<?>> arr = Collections.unmodifiableList(techs);
-        CtxImpl impl = new CtxImpl(arr);
+        CtxImpl impl = new CtxImpl(context, arr);
         BrwsrCtx ctx = CtxAccssr.getDefault().newContext(impl);
         return ctx;
     }
@@ -85,7 +89,7 @@
         techs.add(new Bind<Tech>(type, impl, priority));
     }
     
-    private static final class Bind<Tech> implements Comparable<Bind<?>> {
+    private static final class Bind<Tech> {
         private final Class<Tech> clazz;
         private final Tech impl;
         private final int priority;
@@ -97,16 +101,39 @@
         }
 
         @Override
-        public int compareTo(Bind<?> o) {
-            if (priority != o.priority) {
-                return priority - o.priority;
-            }
-            return clazz.getName().compareTo(o.clazz.getName());
-        }
-
-        @Override
         public String toString() {
             return "Bind{" + "clazz=" + clazz + "@" + clazz.getClassLoader() + ", impl=" + impl + ", priority=" + priority + '}';
         }
     }
+    
+    private final class BindCompare implements Comparator<Bind<?>> {
+        boolean isPrefered(Bind<?> b) {
+            final Class<?> implClazz = b.impl.getClass();
+            Contexts.Id id = implClazz.getAnnotation(Contexts.Id.class);
+            if (id == null) {
+                return false;
+            }
+            for (String v : id.value()) {
+                for (Object c : context) {
+                    if (v.equals(c)) {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+        
+        @Override
+        public int compare(Bind<?> o1, Bind<?> o2) {
+            boolean p1 = isPrefered(o1);
+            boolean p2 = isPrefered(o2);
+            if (p1 != p2) {
+                return p1 ? -1 : 1;
+            }
+            if (o1.priority != o2.priority) {
+                return o1.priority - o2.priority;
+            }
+            return o1.clazz.getName().compareTo(o2.clazz.getName());
+        }
+    } // end of BindCompare
 }
diff --git a/context/src/main/java/org/netbeans/html/context/spi/Contexts.java b/context/src/main/java/org/netbeans/html/context/spi/Contexts.java
--- a/context/src/main/java/org/netbeans/html/context/spi/Contexts.java
+++ b/context/src/main/java/org/netbeans/html/context/spi/Contexts.java
@@ -42,6 +42,10 @@
  */
 package org.netbeans.html.context.spi;
 
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
 import java.util.ServiceLoader;
 import net.java.html.BrwsrCtx;
 import org.netbeans.html.context.impl.CtxImpl;
@@ -59,11 +63,23 @@
 
     /** Creates new, empty builder for creation of {@link BrwsrCtx}. At the
      * end call the {@link Builder#build()} method to generate the context.
-     *
+     * 
+     * @param context instances of various classes or names of {@link Id technologies} 
+     *    to be preferred and used in the built {@link BrwsrCtx context}.
+     * @return new instance of the builder
+     * @since 1.1
+     */
+    public static Builder newBuilder(Object... context) {
+        return new Builder(context);
+    }
+    /** Creates new, empty builder for creation of {@link BrwsrCtx}. At the
+     * end call the {@link Builder#build()} method to generate the context.
+     * Simply calls {@link #newBuilder(java.lang.Object...) newBuilder(new Object[0])}.
+     * 
      * @return new instance of the builder
      */
     public static Builder newBuilder() {
-        return new Builder();
+        return newBuilder(new Object[0]);
     }
 
     /** Seeks for the specified technology in the provided context.
@@ -118,6 +134,23 @@
         }
         return found;
     }
+    
+    /** Identifies the technologies passed to {@link Builder context builder}
+     * by a name. Each implementation of a technology 
+     * {@link Builder#register(java.lang.Class, java.lang.Object, int) registered into a context}
+     * can be annotated with a name (or multiple names). Such implementation
+     * will later be 
+     * {@link Contexts#fillInByProviders(java.lang.Class, org.netbeans.html.context.spi.Contexts.Builder)  preferred during lookup}
+     * if their name(s) has been requested in when 
+     * {@link Contexts#newBuilder(java.lang.Object...)  creating a context}.
+     * @since 1.1
+     */
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target(ElementType.TYPE)
+    public @interface Id {
+        /** Identifier(s) for the implementation. */
+        public String[] value();
+    }
 
     /** Implementors of various HTML technologies should
      * register their implementation via <code>org.openide.util.lookup.ServiceProvider</code>, so
@@ -152,9 +185,10 @@
      * @author Jaroslav Tulach
      */
     public static final class Builder {
-        private final CtxImpl impl = new CtxImpl();
+        private final CtxImpl impl;
 
-        Builder() {
+        public Builder(Object[] context) {
+            this.impl = new CtxImpl(context);
         }
         
         /** Registers new technology into the context. Each technology is
diff --git a/context/src/test/java/net/java/html/BrwsrCtxTest.java b/context/src/test/java/net/java/html/BrwsrCtxTest.java
--- a/context/src/test/java/net/java/html/BrwsrCtxTest.java
+++ b/context/src/test/java/net/java/html/BrwsrCtxTest.java
@@ -44,6 +44,7 @@
 
 import org.netbeans.html.context.spi.Contexts;
 import static org.testng.Assert.*;
+import org.testng.annotations.Test;
 
 /**
  *
@@ -72,4 +73,48 @@
         assertTrue(arr[0], "Runnable was executed");
     }
     
+    
+    @Test public void defaultOrderOfRegistrations() {
+        BrwsrCtx ctx = registerRs(Contexts.newBuilder());
+        Class<? extends Runnable> clazz = Contexts.find(ctx, Runnable.class).getClass();
+        assertEquals(clazz, R1.class, "R1 is registered at value 10");
+    }
+    
+    @Test public void preferOne() {
+        BrwsrCtx ctx = registerRs(Contexts.newBuilder("one"));
+        Class<? extends Runnable> clazz = Contexts.find(ctx, Runnable.class).getClass();
+        assertEquals(clazz, R1.class, "R1 is registered at value 10");
+    }
+
+    @Test public void preferTwo() {
+        BrwsrCtx ctx = registerRs(Contexts.newBuilder("two"));
+        Class<? extends Runnable> clazz = Contexts.find(ctx, Runnable.class).getClass();
+        assertEquals(clazz, R2.class, "R2 is preferred");
+    }
+
+    @Test public void preferBoth() {
+        BrwsrCtx ctx = registerRs(Contexts.newBuilder("one", "two"));
+        Class<? extends Runnable> clazz = Contexts.find(ctx, Runnable.class).getClass();
+        assertEquals(clazz, R1.class, "R1 is registered at value 10");
+    }
+    
+    private static BrwsrCtx registerRs(Contexts.Builder b) {
+        b.register(Runnable.class, new R1(), 10);
+        b.register(Runnable.class, new R2(), 20);
+        return b.build();
+    }
+
+    @Contexts.Id("one")
+    static final class R1 implements Runnable {
+        @Override
+        public void run() {
+        }
+    }
+    @Contexts.Id("two")
+    static final class R2 implements Runnable {
+        @Override
+        public void run() {
+        }
+    }
+    
 }
\ No newline at end of file
diff --git a/json/src/main/java/org/netbeans/html/json/spi/Technology.java b/json/src/main/java/org/netbeans/html/json/spi/Technology.java
--- a/json/src/main/java/org/netbeans/html/json/spi/Technology.java
+++ b/json/src/main/java/org/netbeans/html/json/spi/Technology.java
@@ -45,10 +45,17 @@
 import net.java.html.BrwsrCtx;
 import net.java.html.json.Model;
 import net.java.html.json.Models;
+import org.netbeans.html.context.spi.Contexts.Id;
 
 /** An implementation of a binding between model classes (see {@link Model})
  * and particular technology like <a href="http://knockoutjs.com">knockout.js</a>
  * in a browser window, etc.
+ * Since introduction of {@link Id technology identifiers} one can choose between
+ * different background implementations to handle the conversion and
+ * communication requests. The currently known provider is
+ * <code>org.netbeans.html:ko4j</code> module which registers 
+ * a <a href="http://knockoutjs.com" target="_blank">knockout.js</a>
+ * implementation called <b>ko4j</b>.
  *
  * @author Jaroslav Tulach
  */
diff --git a/json/src/main/java/org/netbeans/html/json/spi/Transfer.java b/json/src/main/java/org/netbeans/html/json/spi/Transfer.java
--- a/json/src/main/java/org/netbeans/html/json/spi/Transfer.java
+++ b/json/src/main/java/org/netbeans/html/json/spi/Transfer.java
@@ -45,9 +45,17 @@
 import java.io.IOException;
 import java.io.InputStream;
 import org.netbeans.html.context.spi.Contexts.Builder;
+import org.netbeans.html.context.spi.Contexts.Id;
 
 /** A {@link Builder service provider interface} responsible for 
  * conversion of JSON objects to Java ones and vice-versa.
+ * Since introduction of {@link Id technology identifiers} one can choose between
+ * different background implementations to handle the conversion and
+ * communication requests. The known providers include
+ * <code>org.netbeans.html:ko4j</code> module which registers 
+ * a native browser implementation called <b>xhr</b>, and a
+ * <code>org.netbeans.html:ko-ws-tyrus</code> module which registers 
+ * Java based implementation named <b>tyrus</b>.
  *
  * @author Jaroslav Tulach
  */
diff --git a/json/src/main/java/org/netbeans/html/json/spi/WSTransfer.java b/json/src/main/java/org/netbeans/html/json/spi/WSTransfer.java
--- a/json/src/main/java/org/netbeans/html/json/spi/WSTransfer.java
+++ b/json/src/main/java/org/netbeans/html/json/spi/WSTransfer.java
@@ -44,9 +44,17 @@
 
 import net.java.html.BrwsrCtx;
 import org.netbeans.html.context.spi.Contexts.Provider;
+import org.netbeans.html.context.spi.Contexts.Id;
 
 /** Interface for providers of WebSocket protocol. Register into a 
- * {@link BrwsrCtx context} in your own {@link Provider}
+ * {@link BrwsrCtx context} in your own {@link Provider}.
+ * Since introduction of {@link Id technology identifiers} one can choose between
+ * different background implementations to handle the conversion and
+ * communication requests. The known providers include
+ * <code>org.netbeans.html:ko4j</code> module which registers 
+ * a native browser implementation called <b>websocket</b>, and a
+ * <code>org.netbeans.html:ko-ws-tyrus</code> module which registers 
+ * Java based implementation named <b>tyrus</b>.
  *
  * @author Jaroslav Tulach
  * @param <WebSocket> internal implementation type representing the socket
diff --git a/ko-felix-test/src/main/java/org/netbeans/html/ko/felix/test/KnockoutFelixTCKImpl.java b/ko-felix-test/src/main/java/org/netbeans/html/ko/felix/test/KnockoutFelixTCKImpl.java
--- a/ko-felix-test/src/main/java/org/netbeans/html/ko/felix/test/KnockoutFelixTCKImpl.java
+++ b/ko-felix-test/src/main/java/org/netbeans/html/ko/felix/test/KnockoutFelixTCKImpl.java
@@ -46,6 +46,7 @@
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -140,16 +141,9 @@
     @Override
     public BrwsrCtx createContext() {
         try {
-            Class<?> fxCls = loadOSGiClass(
-                "org.netbeans.html.ko4j.FXContext",
-                FrameworkUtil.getBundle(KnockoutFelixTCKImpl.class).getBundleContext()
-            );
-            final Constructor<?> cnstr = fxCls.getConstructor(Fn.Presenter.class);
-            cnstr.setAccessible(true);
-            Object fx = cnstr.newInstance(browserContext);
             Contexts.Builder cb = Contexts.newBuilder().
-                register(Technology.class, (Technology)fx, 10).
-                register(Transfer.class, (Transfer)fx, 10).
+                register(Technology.class, (Technology)osgiInstance("KOTech"), 10).
+                register(Transfer.class, (Transfer)osgiInstance("KOTransfer"), 10).
                 register(Executor.class, (Executor)browserContext, 10);
 //        if (fx.areWebSocketsSupported()) {
 //            cb.register(WSTransfer.class, fx, 10);
@@ -160,6 +154,17 @@
         }
     }
 
+    private Object osgiInstance(String simpleName) throws IllegalAccessException, SecurityException, IllegalArgumentException, Exception, NoSuchMethodException, InstantiationException, InvocationTargetException {
+        Class<?> fxCls = loadOSGiClass(
+                "org.netbeans.html.ko4j." + simpleName,
+                FrameworkUtil.getBundle(KnockoutFelixTCKImpl.class).getBundleContext()
+        );
+        final Constructor<?> cnstr = fxCls.getDeclaredConstructor();
+        cnstr.setAccessible(true);
+        Object fx = cnstr.newInstance();
+        return fx;
+    }
+
     @Override
     public Object createJSON(Map<String, Object> values) {
         JSONObject json = new JSONObject();
diff --git a/ko-osgi-test/src/main/java/org/netbeans/html/ko/osgi/test/KnockoutEquinoxTCKImpl.java b/ko-osgi-test/src/main/java/org/netbeans/html/ko/osgi/test/KnockoutEquinoxTCKImpl.java
--- a/ko-osgi-test/src/main/java/org/netbeans/html/ko/osgi/test/KnockoutEquinoxTCKImpl.java
+++ b/ko-osgi-test/src/main/java/org/netbeans/html/ko/osgi/test/KnockoutEquinoxTCKImpl.java
@@ -46,6 +46,7 @@
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -135,16 +136,9 @@
     @Override
     public BrwsrCtx createContext() {
         try {
-            Class<?> fxCls = loadOSGiClass(
-                "org.netbeans.html.ko4j.FXContext",
-                FrameworkUtil.getBundle(KnockoutEquinoxTCKImpl.class).getBundleContext()
-            );
-            final Constructor<?> cnstr = fxCls.getConstructor(Fn.Presenter.class);
-            cnstr.setAccessible(true);
-            Object fx = cnstr.newInstance(browserContext);
             Contexts.Builder cb = Contexts.newBuilder().
-                register(Technology.class, (Technology)fx, 10).
-                register(Transfer.class, (Transfer)fx, 10).
+                register(Technology.class, (Technology)osgiInstance("KOTech"), 10).
+                register(Transfer.class, (Transfer)osgiInstance("KOTransfer"), 10).
                 register(Executor.class, (Executor)browserContext, 10);
 //        if (fx.areWebSocketsSupported()) {
 //            cb.register(WSTransfer.class, fx, 10);
@@ -154,6 +148,16 @@
             throw new IllegalStateException(ex);
         }
     }
+    private Object osgiInstance(String simpleName) throws IllegalAccessException, SecurityException, IllegalArgumentException, Exception, NoSuchMethodException, InstantiationException, InvocationTargetException {
+        Class<?> fxCls = loadOSGiClass(
+                "org.netbeans.html.ko4j." + simpleName,
+                FrameworkUtil.getBundle(KnockoutEquinoxTCKImpl.class).getBundleContext()
+        );
+        final Constructor<?> cnstr = fxCls.getDeclaredConstructor();
+        cnstr.setAccessible(true);
+        Object fx = cnstr.newInstance();
+        return fx;
+    }
 
     @Override
     public Object createJSON(Map<String, Object> values) {
diff --git a/ko-ws-tyrus/src/main/java/org/netbeans/html/wstyrus/TyrusContext.java b/ko-ws-tyrus/src/main/java/org/netbeans/html/wstyrus/TyrusContext.java
--- a/ko-ws-tyrus/src/main/java/org/netbeans/html/wstyrus/TyrusContext.java
+++ b/ko-ws-tyrus/src/main/java/org/netbeans/html/wstyrus/TyrusContext.java
@@ -82,6 +82,7 @@
  *
  * @author Jaroslav Tulach
  */
+@Contexts.Id("tyrus")
 @ServiceProvider(service = Contexts.Provider.class)
 public final class TyrusContext 
 implements Contexts.Provider, WSTransfer<Comm>, Transfer {
diff --git a/ko4j/src/main/java/org/netbeans/html/ko4j/KO4J.java b/ko4j/src/main/java/org/netbeans/html/ko4j/KO4J.java
--- a/ko4j/src/main/java/org/netbeans/html/ko4j/KO4J.java
+++ b/ko4j/src/main/java/org/netbeans/html/ko4j/KO4J.java
@@ -42,7 +42,9 @@
  */
 package org.netbeans.html.ko4j;
 
+import java.util.logging.Logger;
 import net.java.html.json.Model;
+import net.java.html.json.OnReceive;
 import org.netbeans.html.boot.spi.Fn;
 import org.netbeans.html.context.spi.Contexts;
 import org.netbeans.html.context.spi.Contexts.Provider;
@@ -54,35 +56,49 @@
 /** Support for <a href="http://knockoutjs.com">knockout.js</a>
  * and its Java binding via {@link Model model classes}.
  * Registers {@link Provider}, so {@link java.util.ServiceLoader} can find it.
+ * The provider registers following technologies:
+ * <ul>
+ * <li><b>ko4j</b> - bindings for <a href="http://knockoutjs.com">knockout.js</a>
+ *   and the classes generated by the {@link Model} annotation.
+ * </li>
+ * <li><b>xhr</b> - <a href="http://www.w3.org/TR/XMLHttpRequest/">XMLHttpRequest</a>
+ *   based implementation for <em>REST</em> calls 
+ *   (<b>GET</b>, <b>PUT</b>, <b>POST</b>, <b>DELETE</b> methods) 
+ *   for {@link OnReceive} annotation.
+ * </li>
+ * <li><b>websocket</b> - 
+ *   native browser <a href="http://www.w3.org/TR/websockets/">websockets</a>
+ *   based implementation for {@link OnReceive} annotation and its <b>WebSocket</b>
+ *   subprotocol.
+ * </li>
+ * </ul>
  *
  * @author Jaroslav Tulach
  * @since 0.7
  */
 @ServiceProvider(service = Provider.class)
 public final class KO4J implements Provider {
-    private final Fn.Presenter presenter;
-    private FXContext c;
+    static final Logger LOG = Logger.getLogger(KOSockets.class.getName());
+    private KOTech ko4j;
+    private KOTransfer trans;
+    private KOSockets socks;
     
     public KO4J() {
         this(null);
     }
-    
+
+    @Deprecated
     public KO4J(Fn.Presenter presenter) {
-        this.presenter = presenter;
-    }
-    
-    private FXContext getKO() {
-        if (c == null) {
-            c = new FXContext(presenter == null ? Fn.activePresenter() : presenter);
-        }
-        return c;
     }
     
     /** Return instance of the knockout.js for Java technology.
      * @return non-null instance
      */
     public Technology knockout() {
-        return getKO();
+        if (ko4j == null) {
+            ko4j = new KOTech();
+        }
+        return ko4j;
     }
     
     /** Browser based implementation of transfer interface. Uses
@@ -91,7 +107,10 @@
      * @return non-null instance
      */
     public Transfer transfer() {
-        return getKO();
+        if (trans == null) {
+            trans = new KOTransfer();
+        }
+        return trans;
     }
     
     /** Returns browser based implementation of websocket transfer.
@@ -102,7 +121,13 @@
      *   <code>WebSocket</code> object in the browser
      */
     public WSTransfer<?> websockets() {
-        return getKO().areWebSocketsSupported() ? getKO() : null;
+        if (!KOSockets.areWebSocketsSupported()) {
+            return null;
+        }
+        if (socks == null) {
+            socks = new KOSockets();
+        }
+        return socks;
     }
 
     /** Registers technologies at position 100:
diff --git a/ko4j/src/main/java/org/netbeans/html/ko4j/FXContext.java b/ko4j/src/main/java/org/netbeans/html/ko4j/KOSockets.java
rename from ko4j/src/main/java/org/netbeans/html/ko4j/FXContext.java
rename to ko4j/src/main/java/org/netbeans/html/ko4j/KOSockets.java
--- a/ko4j/src/main/java/org/netbeans/html/ko4j/FXContext.java
+++ b/ko4j/src/main/java/org/netbeans/html/ko4j/KOSockets.java
@@ -42,20 +42,9 @@
  */
 package org.netbeans.html.ko4j;
 
-import java.io.ByteArrayOutputStream;
-import java.io.Closeable;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.Reader;
-import java.net.URL;
-import java.util.logging.Logger;
-import org.netbeans.html.boot.spi.Fn;
-import org.netbeans.html.json.spi.FunctionBinding;
+import net.java.html.js.JavaScriptBody;
+import org.netbeans.html.context.spi.Contexts;
 import org.netbeans.html.json.spi.JSONCall;
-import org.netbeans.html.json.spi.PropertyBinding;
-import org.netbeans.html.json.spi.Technology;
-import org.netbeans.html.json.spi.Transfer;
 import org.netbeans.html.json.spi.WSTransfer;
 
 /** This is an implementation package - just
@@ -65,134 +54,13 @@
  *
  * @author Jaroslav Tulach
  */
-final class FXContext
-implements Technology.BatchInit<Object>, Technology.ValueMutated<Object>,
-Transfer, WSTransfer<LoadWS> {
-    static final Logger LOG = Logger.getLogger(FXContext.class.getName());
-    private Object[] jsObjects;
-    private int jsIndex;
-
-    public FXContext(Fn.Presenter browserContext) {
+@Contexts.Id("websocket")
+final class KOSockets
+implements WSTransfer<LoadWS> {
+    KOSockets() {
     }
     
     @Override
-    public Object wrapModel(Object model, PropertyBinding[] propArr, FunctionBinding[] funcArr) {
-        String[] propNames = new String[propArr.length];
-        boolean[] propReadOnly = new boolean[propArr.length];
-        Object[] propValues = new Object[propArr.length];
-        for (int i = 0; i < propNames.length; i++) {
-            propNames[i] = propArr[i].getPropertyName();
-            propReadOnly[i] = propArr[i].isReadOnly();
-            propValues[i] = propArr[i].getValue();
-        }
-        String[] funcNames = new String[funcArr.length];
-        for (int i = 0; i < funcNames.length; i++) {
-            funcNames[i] = funcArr[i].getFunctionName();
-        }
-        Object ret = getJSObject();
-        Knockout.wrapModel(ret, model, 
-            propNames, propReadOnly, propValues, propArr,
-            funcNames, funcArr
-        );
-        return ret;
-    }
-    
-    private Object getJSObject() {
-        int len = 64;
-        if (jsObjects != null && jsIndex < (len = jsObjects.length)) {
-            return jsObjects[jsIndex++];
-        }
-        jsObjects = Knockout.allocJS(len * 2);
-        jsIndex = 1;
-        return jsObjects[0];
-    }
-    
-    @Override
-    public Object wrapModel(Object model) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void bind(PropertyBinding b, Object model, Object data) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void valueHasMutated(Object data, String propertyName) {
-        Knockout.valueHasMutated(data, propertyName, null, null);
-    }
-    
-    @Override
-    public void valueHasMutated(Object data, String propertyName, Object oldValue, Object newValue) {
-        Knockout.valueHasMutated(data, propertyName, oldValue, newValue);
-    }
-
-    @Override
-    public void expose(FunctionBinding fb, Object model, Object d) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void applyBindings(Object data) {
-        Knockout.applyBindings(data);
-    }
-
-    @Override
-    public Object wrapArray(Object[] arr) {
-        return arr;
-    }
-
-    @Override
-    public void extract(Object obj, String[] props, Object[] values) {
-        LoadJSON.extractJSON(obj, props, values);
-    }
-
-    @Override
-    public void loadJSON(final JSONCall call) {
-        if (call.isJSONP()) {
-            String me = LoadJSON.createJSONP(call);
-            LoadJSON.loadJSONP(call.composeURL(me), me);
-        } else {
-            String data = null;
-            if (call.isDoOutput()) {
-                try {
-                    ByteArrayOutputStream bos = new ByteArrayOutputStream();
-                    call.writeData(bos);
-                    data = new String(bos.toByteArray(), "UTF-8");
-                } catch (IOException ex) {
-                    call.notifyError(ex);
-                }
-            }
-            LoadJSON.loadJSON(call.composeURL(null), call, call.getMethod(), data);
-        }
-    }
-
-    @Override
-    public <M> M toModel(Class<M> modelClass, Object data) {
-        return modelClass.cast(Knockout.toModel(data));
-    }
-
-    @Override
-    public Object toJSON(InputStream is) throws IOException {
-        StringBuilder sb = new StringBuilder();
-        InputStreamReader r = new InputStreamReader(is);
-        for (;;) {
-            int ch = r.read();
-            if (ch == -1) {
-                break;
-            }
-            sb.append((char)ch);
-        }
-        return LoadJSON.parse(sb.toString());
-    }
-
-    @Override
-    public void runSafe(final Runnable r) {
-        LOG.warning("Technology.runSafe has been deprecated. Use BrwsrCtx.execute!");
-        r.run();
-    }
-
-    @Override
     public LoadWS open(String url, JSONCall onReply) {
         return new LoadWS(onReply, url);
     }
@@ -207,27 +75,8 @@
         socket.close();
     }
 
-    boolean areWebSocketsSupported() {
-        return Knockout.areWebSocketsSupported();
+    @JavaScriptBody(args = {}, body = "if (window['WebSocket']) return true; else return false;")
+    static final boolean areWebSocketsSupported() {
+        return false;
     }
-
-    private static final class TrueFn extends Fn implements Fn.Presenter {
-        @Override
-        public Object invoke(Object thiz, Object... args) throws Exception {
-            return true;
-        }
-
-        @Override
-        public Fn defineFn(String code, String... names) {
-            return this;
-        }
-
-        @Override
-        public void displayPage(URL page, Runnable onPageLoad) {
-        }
-
-        @Override
-        public void loadScript(Reader code) throws Exception {
-        }
-    } // end of TrueFn
 }
diff --git a/ko4j/src/main/java/org/netbeans/html/ko4j/FXContext.java b/ko4j/src/main/java/org/netbeans/html/ko4j/KOTech.java
copy from ko4j/src/main/java/org/netbeans/html/ko4j/FXContext.java
copy to ko4j/src/main/java/org/netbeans/html/ko4j/KOTech.java
--- a/ko4j/src/main/java/org/netbeans/html/ko4j/FXContext.java
+++ b/ko4j/src/main/java/org/netbeans/html/ko4j/KOTech.java
@@ -42,21 +42,11 @@
  */
 package org.netbeans.html.ko4j;
 
-import java.io.ByteArrayOutputStream;
-import java.io.Closeable;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.Reader;
-import java.net.URL;
-import java.util.logging.Logger;
-import org.netbeans.html.boot.spi.Fn;
+import org.netbeans.html.context.spi.Contexts;
 import org.netbeans.html.json.spi.FunctionBinding;
-import org.netbeans.html.json.spi.JSONCall;
 import org.netbeans.html.json.spi.PropertyBinding;
 import org.netbeans.html.json.spi.Technology;
-import org.netbeans.html.json.spi.Transfer;
-import org.netbeans.html.json.spi.WSTransfer;
+import static org.netbeans.html.ko4j.KO4J.LOG;
 
 /** This is an implementation package - just
  * include its JAR on classpath and use official {@link Context} API
@@ -65,14 +55,13 @@
  *
  * @author Jaroslav Tulach
  */
-final class FXContext
-implements Technology.BatchInit<Object>, Technology.ValueMutated<Object>,
-Transfer, WSTransfer<LoadWS> {
-    static final Logger LOG = Logger.getLogger(FXContext.class.getName());
+@Contexts.Id("ko4j")
+final class KOTech
+implements Technology.BatchInit<Object>, Technology.ValueMutated<Object> {
     private Object[] jsObjects;
     private int jsIndex;
 
-    public FXContext(Fn.Presenter browserContext) {
+    public KOTech() {
     }
     
     @Override
@@ -141,93 +130,15 @@
     public Object wrapArray(Object[] arr) {
         return arr;
     }
-
+    
     @Override
-    public void extract(Object obj, String[] props, Object[] values) {
-        LoadJSON.extractJSON(obj, props, values);
-    }
-
-    @Override
-    public void loadJSON(final JSONCall call) {
-        if (call.isJSONP()) {
-            String me = LoadJSON.createJSONP(call);
-            LoadJSON.loadJSONP(call.composeURL(me), me);
-        } else {
-            String data = null;
-            if (call.isDoOutput()) {
-                try {
-                    ByteArrayOutputStream bos = new ByteArrayOutputStream();
-                    call.writeData(bos);
-                    data = new String(bos.toByteArray(), "UTF-8");
-                } catch (IOException ex) {
-                    call.notifyError(ex);
-                }
-            }
-            LoadJSON.loadJSON(call.composeURL(null), call, call.getMethod(), data);
-        }
-    }
+    public void runSafe(final Runnable r) {
+        LOG.warning("Technology.runSafe has been deprecated. Use BrwsrCtx.execute!");
+        r.run();
+    }    
 
     @Override
     public <M> M toModel(Class<M> modelClass, Object data) {
         return modelClass.cast(Knockout.toModel(data));
     }
-
-    @Override
-    public Object toJSON(InputStream is) throws IOException {
-        StringBuilder sb = new StringBuilder();
-        InputStreamReader r = new InputStreamReader(is);
-        for (;;) {
-            int ch = r.read();
-            if (ch == -1) {
-                break;
-            }
-            sb.append((char)ch);
-        }
-        return LoadJSON.parse(sb.toString());
-    }
-
-    @Override
-    public void runSafe(final Runnable r) {
-        LOG.warning("Technology.runSafe has been deprecated. Use BrwsrCtx.execute!");
-        r.run();
-    }
-
-    @Override
-    public LoadWS open(String url, JSONCall onReply) {
-        return new LoadWS(onReply, url);
-    }
-
-    @Override
-    public void send(LoadWS socket, JSONCall data) {
-        socket.send(data);
-    }
-
-    @Override
-    public void close(LoadWS socket) {
-        socket.close();
-    }
-
-    boolean areWebSocketsSupported() {
-        return Knockout.areWebSocketsSupported();
-    }
-
-    private static final class TrueFn extends Fn implements Fn.Presenter {
-        @Override
-        public Object invoke(Object thiz, Object... args) throws Exception {
-            return true;
-        }
-
-        @Override
-        public Fn defineFn(String code, String... names) {
-            return this;
-        }
-
-        @Override
-        public void displayPage(URL page, Runnable onPageLoad) {
-        }
-
-        @Override
-        public void loadScript(Reader code) throws Exception {
-        }
-    } // end of TrueFn
 }
diff --git a/ko4j/src/main/java/org/netbeans/html/ko4j/FXContext.java b/ko4j/src/main/java/org/netbeans/html/ko4j/KOTransfer.java
copy from ko4j/src/main/java/org/netbeans/html/ko4j/FXContext.java
copy to ko4j/src/main/java/org/netbeans/html/ko4j/KOTransfer.java
--- a/ko4j/src/main/java/org/netbeans/html/ko4j/FXContext.java
+++ b/ko4j/src/main/java/org/netbeans/html/ko4j/KOTransfer.java
@@ -43,20 +43,12 @@
 package org.netbeans.html.ko4j;
 
 import java.io.ByteArrayOutputStream;
-import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
-import java.io.Reader;
-import java.net.URL;
-import java.util.logging.Logger;
-import org.netbeans.html.boot.spi.Fn;
-import org.netbeans.html.json.spi.FunctionBinding;
+import org.netbeans.html.context.spi.Contexts;
 import org.netbeans.html.json.spi.JSONCall;
-import org.netbeans.html.json.spi.PropertyBinding;
-import org.netbeans.html.json.spi.Technology;
 import org.netbeans.html.json.spi.Transfer;
-import org.netbeans.html.json.spi.WSTransfer;
 
 /** This is an implementation package - just
  * include its JAR on classpath and use official {@link Context} API
@@ -65,84 +57,13 @@
  *
  * @author Jaroslav Tulach
  */
-final class FXContext
-implements Technology.BatchInit<Object>, Technology.ValueMutated<Object>,
-Transfer, WSTransfer<LoadWS> {
-    static final Logger LOG = Logger.getLogger(FXContext.class.getName());
-    private Object[] jsObjects;
-    private int jsIndex;
-
-    public FXContext(Fn.Presenter browserContext) {
+@Contexts.Id("xhr")
+final class KOTransfer
+implements Transfer {
+    KOTransfer() {
     }
     
     @Override
-    public Object wrapModel(Object model, PropertyBinding[] propArr, FunctionBinding[] funcArr) {
-        String[] propNames = new String[propArr.length];
-        boolean[] propReadOnly = new boolean[propArr.length];
-        Object[] propValues = new Object[propArr.length];
-        for (int i = 0; i < propNames.length; i++) {
-            propNames[i] = propArr[i].getPropertyName();
-            propReadOnly[i] = propArr[i].isReadOnly();
-            propValues[i] = propArr[i].getValue();
-        }
-        String[] funcNames = new String[funcArr.length];
-        for (int i = 0; i < funcNames.length; i++) {
-            funcNames[i] = funcArr[i].getFunctionName();
-        }
-        Object ret = getJSObject();
-        Knockout.wrapModel(ret, model, 
-            propNames, propReadOnly, propValues, propArr,
-            funcNames, funcArr
-        );
-        return ret;
-    }
-    
-    private Object getJSObject() {
-        int len = 64;
-        if (jsObjects != null && jsIndex < (len = jsObjects.length)) {
-            return jsObjects[jsIndex++];
-        }
-        jsObjects = Knockout.allocJS(len * 2);
-        jsIndex = 1;
-        return jsObjects[0];
-    }
-    
-    @Override
-    public Object wrapModel(Object model) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void bind(PropertyBinding b, Object model, Object data) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void valueHasMutated(Object data, String propertyName) {
-        Knockout.valueHasMutated(data, propertyName, null, null);
-    }
-    
-    @Override
-    public void valueHasMutated(Object data, String propertyName, Object oldValue, Object newValue) {
-        Knockout.valueHasMutated(data, propertyName, oldValue, newValue);
-    }
-
-    @Override
-    public void expose(FunctionBinding fb, Object model, Object d) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void applyBindings(Object data) {
-        Knockout.applyBindings(data);
-    }
-
-    @Override
-    public Object wrapArray(Object[] arr) {
-        return arr;
-    }
-
-    @Override
     public void extract(Object obj, String[] props, Object[] values) {
         LoadJSON.extractJSON(obj, props, values);
     }
@@ -168,11 +89,6 @@
     }
 
     @Override
-    public <M> M toModel(Class<M> modelClass, Object data) {
-        return modelClass.cast(Knockout.toModel(data));
-    }
-
-    @Override
     public Object toJSON(InputStream is) throws IOException {
         StringBuilder sb = new StringBuilder();
         InputStreamReader r = new InputStreamReader(is);
@@ -185,49 +101,4 @@
         }
         return LoadJSON.parse(sb.toString());
     }
-
-    @Override
-    public void runSafe(final Runnable r) {
-        LOG.warning("Technology.runSafe has been deprecated. Use BrwsrCtx.execute!");
-        r.run();
-    }
-
-    @Override
-    public LoadWS open(String url, JSONCall onReply) {
-        return new LoadWS(onReply, url);
-    }
-
-    @Override
-    public void send(LoadWS socket, JSONCall data) {
-        socket.send(data);
-    }
-
-    @Override
-    public void close(LoadWS socket) {
-        socket.close();
-    }
-
-    boolean areWebSocketsSupported() {
-        return Knockout.areWebSocketsSupported();
-    }
-
-    private static final class TrueFn extends Fn implements Fn.Presenter {
-        @Override
-        public Object invoke(Object thiz, Object... args) throws Exception {
-            return true;
-        }
-
-        @Override
-        public Fn defineFn(String code, String... names) {
-            return this;
-        }
-
-        @Override
-        public void displayPage(URL page, Runnable onPageLoad) {
-        }
-
-        @Override
-        public void loadScript(Reader code) throws Exception {
-        }
-    } // end of TrueFn
 }
diff --git a/ko4j/src/main/java/org/netbeans/html/ko4j/Knockout.java b/ko4j/src/main/java/org/netbeans/html/ko4j/Knockout.java
--- a/ko4j/src/main/java/org/netbeans/html/ko4j/Knockout.java
+++ b/ko4j/src/main/java/org/netbeans/html/ko4j/Knockout.java
@@ -153,9 +153,4 @@
     static Object toModel(Object wrapper) {
         return toModelImpl(wrapper);
     }
-    
-    @JavaScriptBody(args = {}, body = "if (window['WebSocket']) return true; else return false;")
-    static final boolean areWebSocketsSupported() {
-        return false;
-    }
 }
diff --git a/ko4j/src/test/java/org/netbeans/html/ko4j/KnockoutFXTest.java b/ko4j/src/test/java/org/netbeans/html/ko4j/KnockoutFXTest.java
--- a/ko4j/src/test/java/org/netbeans/html/ko4j/KnockoutFXTest.java
+++ b/ko4j/src/test/java/org/netbeans/html/ko4j/KnockoutFXTest.java
@@ -66,7 +66,6 @@
 import org.netbeans.html.json.spi.WSTransfer;
 import org.netbeans.html.json.tck.KOTest;
 import org.netbeans.html.json.tck.KnockoutTCK;
-import org.netbeans.html.boot.impl.FnContext;
 import org.openide.util.lookup.ServiceProvider;
 import org.testng.Assert;
 import static org.testng.Assert.*;
@@ -154,12 +153,12 @@
     
     @Override
     public BrwsrCtx createContext() {
-        FXContext fx = new FXContext(browserContext);
+        KO4J ko4j = new KO4J();
         Contexts.Builder cb = Contexts.newBuilder().
-            register(Technology.class, fx, 10).
-            register(Transfer.class, fx, 10);
-        if (fx.areWebSocketsSupported()) {
-            cb.register(WSTransfer.class, fx, 10);
+            register(Technology.class, ko4j.knockout(), 10).
+            register(Transfer.class, ko4j.transfer(), 10);
+        if (ko4j.websockets() != null) {
+            cb.register(WSTransfer.class, ko4j.websockets(), 10);
         }
         cb.register(Executor.class, (Executor)browserContext, 10);
         cb.register(Fn.Presenter.class, browserContext, 10);
diff --git a/src/main/javadoc/overview.html b/src/main/javadoc/overview.html
--- a/src/main/javadoc/overview.html
+++ b/src/main/javadoc/overview.html
@@ -75,6 +75,27 @@
          yet the application code can be written in Java.
         </p>
         
+        <h3>What's New in Version 1.1?</h3>
+        
+        <p>
+            The content of a {@link net.java.html.BrwsrCtx context}
+            can be selected by registering implementations under specific
+            {@link org.netbeans.html.context.spi.Contexts.Id technology identifiers} 
+            and requesting them during 
+            {@link org.netbeans.html.context.spi.Contexts#newBuilder(java.lang.Object...) construction} 
+            of the context. <code>org.netbeans.html:ko4j</code> module's implementation
+            offers <b>ko4j</b>, <b>xhr</b> and <b>websocket</b> identifiers
+            for its registered services 
+            (e.g. {@link org.netbeans.html.json.spi.Technology},
+            {@link org.netbeans.html.json.spi.Transfer} and
+            {@link org.netbeans.html.json.spi.WSTransfer}).
+            <code>org.netbeans.html:ko-ws-tyrus</code>
+            module registers its 
+            {@link org.netbeans.html.json.spi.Transfer Java based JSON} and 
+            {@link org.netbeans.html.json.spi.WSTransfer WebSocket} implementations
+            under the name <b>tyrus</b>.
+        </p>
+        
         <h3>What's New in Version 1.0?</h3>
         
         <p>