The xdm-config file provides a rich set of options, when it comes
to defined scripts and other configuration files. In many cases,
the defaults provided with your distribution should be fine, but
for those of you who want more ...
The names of the startup scripts and configuration files used by
XDM are determined by a series of statements in the top-level
xdm-config file. This permits you to configure a different set
of files for different X servers and X terminals, with different
abilities.
For example, say you are using XDM to manage your local display, but
also want it to accept queries from other X terminals on the network.
It is possible to specify a different Xresources file for each of these
cases, by using the following 2 lines in xdm-config:
DisplayManager._0.resources /etc/X11/xdm/Xres_0
DisplayManager*resources /etc/X11/xdm/Xresources
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This will use Xres_0 for the local display (_0 is the XDM way of
saying :0) and Xresources for everything else (the '*').
Similarly, if you wanted a particular resource file for a specific
host, you would use an entry like the following:
DisplayManager.host_0.resources /etc/X11/xdm/Xres_host_0
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Note that XDM configuration files use the terminology host_0, where you
would normally use host:0, to designate 'display 0 on host'.
If you look over your default xdm-config file, you will probably
find that it has been setup so that your local X server has different
files to the remote ones anyway, as different things must be performed
on startup and reset of the server. My Debian file has the following
for local servers:
DisplayManager._0.resources: /etc/X11/xdm/Xresources_0
DisplayManager._0.setup: /etc/X11/xdm/Xsetup_0
DisplayManager._0.startup: /etc/X11/xdm/Xstartup_0
DisplayManager._0.reset: /etc/X11/xdm/Xreset_0
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and the following for remote servers:
DisplayManager*resources: /etc/X11/xdm/Xresources
DisplayManager*setup: /etc/X11/xdm/Xsetup
DisplayManager*startup: /etc/X11/xdm/Xstartup
DisplayManager*reset: /etc/X11/xdm/Xreset
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This document has only briefly touched on the available X resources, but
I should mention that it is possible to fully configure XDM via the Xresources
file.
The following may all be changed if required:
There is a more detailed discussion of XDM resources, on Richard Kaszeta's web site
(see Section 7)
Take our 
