diff -r bc7097419dfd dlight.nativeexecution/release/bin/nativeexecution/hostinfo.sh
--- a/dlight.nativeexecution/release/bin/nativeexecution/hostinfo.sh	Thu Nov 12 17:45:13 2009 +0300
+++ b/dlight.nativeexecution/release/bin/nativeexecution/hostinfo.sh	Thu Nov 12 21:23:35 2009 +0300
@@ -65,7 +65,7 @@
 USER=${USER:-`logname 2>/dev/null`}
 USER=${USER:-${USERNAME}}
 TMPBASE=${TMPBASE:-/var/tmp}
-TMPDIRBASE=${TMPBASE}/dlight_${USER}
+TMPDIRBASE=${TMPBASE}/dlight_${USER}/${NB_KEY}
 mkdir -p "${TMPDIRBASE}"
 
 echo BITNESS=${BITNESS}
diff -r bc7097419dfd dlight.nativeexecution/src/org/netbeans/modules/nativeexecution/support/hostinfo/impl/HostInfoFactory.java
--- a/dlight.nativeexecution/src/org/netbeans/modules/nativeexecution/support/hostinfo/impl/HostInfoFactory.java	Thu Nov 12 17:45:13 2009 +0300
+++ b/dlight.nativeexecution/src/org/netbeans/modules/nativeexecution/support/hostinfo/impl/HostInfoFactory.java	Thu Nov 12 21:23:35 2009 +0300
@@ -39,6 +39,8 @@
 package org.netbeans.modules.nativeexecution.support.hostinfo.impl;
 
 import java.io.File;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
@@ -217,4 +219,19 @@
             this.name = name;
         }
     }
+
+    /**
+     * @return unique key of the current NB instance, introduced to fix bug #176526
+     */
+    /*package-local*/ static String getNBKey() {
+        // use NB userdir to prevent local collisions
+        int hashCode = System.getProperty("netbeans.user", "").hashCode();
+        try {
+            // use host name to prevent remote collisions
+            InetAddress localhost = InetAddress.getLocalHost();
+            hashCode = 3 * hashCode + 5 * localhost.getHostName().hashCode();
+        } catch (UnknownHostException ex) {
+        }
+        return Integer.toHexString(hashCode);
+    }
 }
diff -r bc7097419dfd dlight.nativeexecution/src/org/netbeans/modules/nativeexecution/support/hostinfo/impl/UnixHostInfoProvider.java
--- a/dlight.nativeexecution/src/org/netbeans/modules/nativeexecution/support/hostinfo/impl/UnixHostInfoProvider.java	Thu Nov 12 17:45:13 2009 +0300
+++ b/dlight.nativeexecution/src/org/netbeans/modules/nativeexecution/support/hostinfo/impl/UnixHostInfoProvider.java	Thu Nov 12 21:23:35 2009 +0300
@@ -109,6 +109,7 @@
 
             pb.environment().put("TMPBASE", tmpDirBase); // NOI18N
             pb.environment().put("PATH", pb.environment().get("PATH") + File.pathSeparator + "/bin:/usr/bin"); // NOI18N
+            pb.environment().put("NB_KEY", HostInfoFactory.getNBKey());
 
             Process hostinfoProcess = pb.start();
 
@@ -165,6 +166,10 @@
                 hiOutputStream = echannel.getOutputStream();
                 hiInputStream = echannel.getInputStream();
 
+                // echannel.setEnv() didn't work, so writing this directly
+                hiOutputStream.write(("NB_KEY=" + HostInfoFactory.getNBKey() + '\n').getBytes()); // NOI18N
+                hiOutputStream.flush();
+
                 BufferedReader scriptReader = new BufferedReader(new FileReader(hostinfoScript));
                 String scriptLine = scriptReader.readLine();
 
diff -r bc7097419dfd dlight.nativeexecution/src/org/netbeans/modules/nativeexecution/support/hostinfo/impl/WindowsHostInfoProvider.java
--- a/dlight.nativeexecution/src/org/netbeans/modules/nativeexecution/support/hostinfo/impl/WindowsHostInfoProvider.java	Thu Nov 12 17:45:13 2009 +0300
+++ b/dlight.nativeexecution/src/org/netbeans/modules/nativeexecution/support/hostinfo/impl/WindowsHostInfoProvider.java	Thu Nov 12 21:23:35 2009 +0300
@@ -110,6 +110,8 @@
 
             _tmpDirFile = new File(ioTmpDir, "dlight_" + env.get("USERNAME")); // NOI18N
 
+            _tmpDirFile = new File(_tmpDirFile, HostInfoFactory.getNBKey());
+
             // create the directory if absent (IZ#174327)
             _tmpDirFile.mkdirs();