PEAR manual already renders in CHM and it takes about 2.4Mb additional load. ZendAPI is not included in xCHM, but present in standart CHM version. I guess it is possible to link these CHM's together, but I doubt somebody will benefit from this if Index and Search capabilities merge. PEAR index can greatly confuse users who learn PHP. Search results make it even worse producing informational garbage gathered from all three files rather than displaying only relevant info. I don't know a way to limit search scope and it seems to me, that having three separate manuals is the best solution.
There is a feature in the CHM creation process to specify zones (collections) for browsing and searching, but this was eventually not implemented too nicely by Microsoft, and completely left undocumented.
http://fox.wikis.com/wc.dll?Wiki~HtmlHelpCollections~VFP Goba
