By default, whenever you perform a query, the search scope is restricted to your local help repository (i.e. Javadocs, API references, user guides contributed by plug-ins).
However, it is possible to add new “search engines” to this scope. For example, even if you don’t have (and I hope you don’t), every Galileo plug-in in your environement, you may want to search information in the whole Galileo help without leaving your workbench. This is as simple as:

• Opening the search UI using “Help > Search” menu
• From the query form, opening the “advanced settings” of your search scope
• Adding a new search engine. Select the “Info Center” type, and use the following URL : http://help.eclipse.org/galileo.

Similarly, you can use any website allowing to perform queries through URL parameters (e.g. Google) as an Eclipse Help search engine.
That’s exactly what we are going to do in order to allow search on Eclipse Community Forums, the new & sexy Web UI on top of Eclipse newsgroups.

This time, you are going to add  a new “Web Search” search engine,

and you will use the following URL pattern: http://www.eclipse.org/forums/index.php?SQ=0&t=search&srch={expression}&btn_submit=Search&field=subject

And voila! Starting from now, you’ll have search results coming from the online Galileo info center and from the Eclipse Community Forums