If you are in an existing X Windows session and would like to open a session on a remote computer that is also running the X server, you can simply use Xnest in the following way:
Xnest :1 -query (remote host)
:1 defines the session number on the local machine (the local X session is usually
The remote host is the 'contact named host for XDMCP', which is the X Display Manager Control Protocol. Here is a HOWTO on the subject.
X Display Manager (xdm) Resources
Many xdm parameters can be set in:
If you have, for example an XConsole, you can alter its position and window state by modifying the follow values: