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A user was asking on nbusers what for are Provided and required Tokens (Versioning and Libraries panels). So it will be nice to add a example of real usage to help. "For example you want to use I/O APIs (org.openide.io). The I/O APIs doesn't contain implementation. The org.netbeans.core.output implements the I/O API and provides required token org.openide.windows.IOProvider. If you want to use the I/O APIs it is better to add the org.openide.windows.IOProvider to required tokens."
Makes most sense in conjunction with a tutorial on using (providing as well as querying) default lookup.
Will add tutorial on this topic and will mention something along the lines suggested by Martin in the helpset.
Default Lookup and related topics is already described in the Developer FAQ and elsewhere. Agree that this is not a suitable topic for the helpset. Marking as WONTFIX.