>One strange thing I found was that Apple Help viewer handles 
>relative URLs as if they are complete.  When using the Finders Help 
>menu (MacHelp) it sends a URL of <http://Mac Help/Mac%20Help> which 
>is relative to the Help folder.

This is considered a feature, not a bug, in Help Viewer. Your opinion 
may vary, of course.

>It also can't open Apple Guide files (although I don't think the 
>real one does this now for some reason)

The Carbon-based version of the Help Viewer does not handle 
AppleGuide files, by design. (It's such a headache.) The Classic 
version of Help Viewer does if you recompile the Guide files and add 
a resource as described in the Apple Help doc.

>The big problem is HTMLRenderingLib though, you specify a GrafPort 
>and it does all the rendering.  It is what doesn't allow selecting 
>text from what I can see.

I'm afraid that's right. Don't see any easy way around it, either. I 
can talk to the AppleHelp engineer (yes, there is only one, I'm 
afraid) and see if she knows of any way around this, but I advise 
against holding one's breath. ;^)
-- 
Otto Schlosser
Apple Technical Publications
otto@...