sorry for the late answer.. I don't need to do this anymore, except that I want the application to send its version number with the requests for the help system so that the infocenter picks the proper entrys fitting to the version.
Is this possible?
The Eclipse Help System does not have any support for handling multiple versions of documents and selecting the correct one. The usual way to do this ( and the way help.ecliipse.org is organized ) is to create a separate infocenter for each major release.