Xsun vs. X?

[Mike Khaw]

What are the differences between the X server named "X" and Xsun?

We have an application (written in Franz Inc's implementation of Common
Windows) that works fine when we start X up with a simple "xinit", but
exhibits poor behavior when started with "xinit -- XSun ..." (when popup
menus are dismissed, the underlying region isn't refreshed, etc.).  I'm
told it has something to do with "X" being a "backing server"(?).

Also, I'd like to run suntools on the color planes of my 3/110 and X on
the b&w overlay plane, but the "X" server seems to take over both sets of
bit planes (Xsun can be told not to, of course, but then I can't run the
above application).

I've RTFM, but I don't see if it's possible to either (a) get "X" not to
take over all the bit planes, or (b) get "Xsun" to act as a "backing
server", if that's the right terminology.

Thanks,
Mike Khaw
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