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→Client Configuration
Edit the '''gdm.conf''' file and in xdmcp section, comment out the 0=standard line under the [servers] section - this will prevent gdm from trying to launch an X server on the local machine - it will simply listen for xdmcp requests. Also, change from VCAllocation=true to VTAllocation=false and comment out the FirstVT=7 line. Change the access restrictions (if any) to suit your needs and then start GDM.
=== Client /Host Configuration ===
On the Client/Host (whatever machine you are connecting from to the VE), you need to install ONLY a bare Xserver as per your OS instructions (use yum, emerge, apt, whatever). A desktop environment like XFCE/GNOME/KDE is entirely optional (and not recommended as it'll unnecessarily just chew up resources on the client) not to mention, they but keep in mind that it won't be used (since while you're connecting to the desktop on the VE).
To get access to the XDM server, just start an Xserver with '''X -query <remote IP> :0''' (where :0 is the local display...set to :1 if you already have an X session running, or use Xnest)
