># man xmacppc
>man: no entry for xmacppc in the manual.
># man Xmacppc
>man: no entry for Xmacppc in the manual.
># exit
>
>How to I tell Xmacppc to use tvtwm? 
>
>Is there Xmacppc documentation?

No, because there's nothing Xmacppc-specific. Xmacppc, Xmac68k, 
XDecNet, XFree86 all start up the same way. They are all (by default) 
started as /usr/X11R6/bin/X which is just a symlink to the X server 
you prefer. You can install XFree and XMacppc side-by-side & change 
which you're using on any given invocation by changing that symlink. 
As the non-Xfree servers mentioned above have absolutely no 
configurable options (none offer mode changes & all take cue from the 
framebuffer's state when invoked/booted), there's little to put into 
a manpage.

>   If yes, where?

For what you're doing, man startx. It helps to try the manpage of the 
actual command you're typing ;-).

You mentioned that you tried ~/.xinitrc...how 'bout posting the 
~/.xinitrc file :)

Mike
-- 
Bikers don't *DO* taglines.