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Nested gdm session

I am preparing for a presentation using X desktop, and want to start another gdm session inside my GNOME desktop environment. It seemed to require long descriptions in the configuration file at first, but  a simple command solved the problem.

$ gdmflexiserver -n

This starts another gdm greeter inside a  Xephyr (if unavailable, Xnest instead) window.

Excellent!
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