I looked into this. From what I read, I don't think this is
supposed to work from compiled help. It can work from WebHelp. What
you are looking for is a "named destination" in Acrobat, not a
"bookmark." Apparently these are two separate things, but the named
destination is accessed like an HTML bookmark, e.g. <A
HREF="filename.pdf#destination>. You can also use a page number,
e.g. <A HREF="filename.pdf#page=4">
Hope this helps.
John