This page discusses starting Xdm on your host computer.
Consult the compuer's operating system and X11 materials for more
details.
Starting Xdm
You must be the root user
to start Xdm. The Xdm executable and configuration files are in /usr/lib/X11/xdm.
Look at the configuration files to be sure they reflect your system
environment. Actual startup will probably be from an rc or rc.local
file on your host.
Xdm Configuration Files
These are the
configuration files for X11R5 XDMCP. Older Xdm systems won't have all
of these files. The xdm-config file contains resources specifying xdm
related data files:DisplayManager.servers:
/usr/lib/X11/xdm/Xservers
DisplayManager.errorLogFile: /usr/lib/X11/xdm/xdm_errors
DisplayManager*resources: /usr/lib/X11/xdm/Xresources
DisplayManager*setup: /usr/lib/X11/xdm/Xsetup
DisplayManager*startup: /usr/lib/X11/xdm/Xstartup
DisplayManager*reset: /usr/lib/X11/xdm/Xreset
DisplayManager*session: /usr/lib/X11/xdm/Xsession
DisplayManager*authorize: false
These files
govern the operation of Xdm on your host. Click on
Xdm Configuation Files for more information about the individual
files.
Host Access Control Security
The Host Access Control Security or "Xdm Magic Cookie" is an
important feature you may want to use or to disable.
Xdm
Authorize
The authorize resource controls the user-based access
control (different from host-based access control governed by xhost).
The example in the paragraph above has access control turned off.
The following resources set access control on for the local
display and then using the unqualified authorize afterward to set
host-based access control for other displays.
...
DisplayManager._0.authorize: true
DisplayManager*authorize: false
...
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