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Nested xdm session under the gdm session

I usually use the gdm for X session manager. Under this circumstance, I wanted to test a xdm, a very traditional X session manager.

Rather than replacing gdm with xdm, I tried to start a xdm within a gdm session.

Here is how I did:

In a gnome-terminal type as follows:

# su
# xdm -server ":1 nest local /usr/bin/Xnest :1 -geometry 800x600"

Cheers!
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