linking between wine books

[Bill Medland]

What to people think?  Should we be linking between different books in the 
wine-doc set?

I had put a link from wine-user to a section in wine-devel.  The pdf was happy 
enough with it but the sgm-to-html choked on it.  Easiest solution is to drop 
the link.  Otherwise can someone point me at an example where it works?