GDM over X forward

[Maik Hentsche <maik mm-double de>]

Hi,
I need your help with the following problem, since I did not find anything
usefull in the documentation:

I am logged in to a linux host from my Win2k-machine, which has an X-server
for window running. I now set the DISPLAY appropiate and started gdm, but even
though it appears in ps, it does not show up on my local host. (I assume, it
shows up on the local display of the linuxserver, but since there is an ocean
between me and this host, I can't tell. How do I tell gdm to go through the
xforward of ssh?

If there is no chance of doing the above, a different solution to the
following problem would also be suitable:
I got a host A, where a user shall log in and work. I got another host B, that
works as some kind of proxy. Finally there is the local host C of that user,
that can not run gdm locally. My idea of a solution is to start gdm via
xforward on B, let it contact gdm on A via XDMCP and transfer the opened
session via xforward to C.

Thanks in advance
Maik