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Here's a way to configure xdm's chooser for host selection:
Edit the xdm startup section of the file that launches xdm with the following lines:
exec /usr/bin/X11/X -indirect hostname
Then, edit /usr/lib/X11/xdm/Xservers and comment out the line which starts the server on the local machine (i.e. starting 0:).
Reboot the machine. You're all set!