gdm.conf
The daemon and the accompanying utilities use a common
configuration file: gdm.conf.  GDM may be
configured to support both system-wide configuration if
built with the --with-configdir option.  This
allows the gdm.conf file to be installed to a directory that can
be mounted across multiple-systems.  Regardless of whether this
option is used, GDM will first look for the gdm.conf file in the
<etc>/gdm directory.  This way
machine-specific configuration always overrides the system-wide
defaults.  The gdm --config option may instead be used to specify
a configuration file installed to another location.  All GDM
utilities (such as All GDM utilities (such as gdmchooser,
gdmsetup, etc.) query the GDM daemon process and will use the same
configuration file as being used by the daemon.  The GDM2
daemon must be restarted to change the configuration file
being used.  GDM 2.8.0.1 and earlier only supported
machine-specific configuration.
The configuration file is divided into sections each containing
variables that define the behavior for a specific part of the GDM
suite.  The file is fairly well commented as well.
gdm.conf follows the standard
.ini style configuration file syntax.  Keywords
in brackets define sections, strings before an equal sign (=) are
variables and the data after equal sign represents their value.  Empty
lines or lines starting with the hash mark (#) are ignored.  The
graphical configurator will try to preserve both comments (lines with
a hash mark) and the overall structure of the file so you can intermix
using the GUI or hand editing the configuration file.
