There are some per user configuration settings that control how GDM
behaves.  Firstly there is the ~/.dmrc file.  In
theory this file should be shared between GDM and KDM, so users only
have to configure things once.  This is a standard
.ini style configuration file.  It has one section
called [Desktop] and can have two keys,
Session, which is the basename of the session
.desktop file that the user wishes to normally use
(but without the .desktop extension)
and a Language key that is the language that the
user wishes to use.  If either of these keys is missing, the system
default is used.  The file would normally look as follows:
[Desktop]
Session=gnome
Language=cs_CZ.UTF-8
The user can also configure a face image for the face browser.  This is
done by copying an image into a file called
~/.face.  This should be a standard image that
GTK+ can read, such as PNG.
Face images can also be placed in the global face directory, which is
normally <share>/pixmaps/faces/
(though this can be configured with the
GlobalFaceDir configuration option) and the
filename should be the name of the user, optionally with a
.png appended.
