GDM
/etc/init.d/gdm, /etc/init/gdm.conf: these two files are used to start gdm (actually gdm-binary).
Default display manager is stored here: /etc/X11/default-display-manager
GDM configuration: http://library.gnome.org/admin/gdm/2.32/gdm.html#configuration
Tools: gdmsetup
/etc/gdm
/user/share/gdm/
After the user logins in, gnome-session is invoked.
http://library.gnome.org/admin/system-admin-guide/stable/sessions-1.html.en
man gnome-session
Default session is specified at /desktop/gnome/session/default_session.
Use gconf-editor to view value of /desktop/gnome/session/default_session. In my case the value is "gnome-settings-daemon".
/usr/lib/gnome-settings-daemon/gnome-settings-daemon --gconf-prefix=/apps/gdm/simple-greeter/settings-manager-plugins. The description of option "--gconf-prefix" is "GConf prefix from which to load plugin settings"
Some resources:
http://live.gnome.org/SessionManagement/GnomeSession
http://standards.freedesktop.org/desktop-entry-spec/latest/
Autostart-spec: http://standards.freedesktop.org/autostart-spec/autostart-spec-latest.html
http://lists.freedesktop.org/archives/xdg/2007-January/007436.html
Autostart apps are specified in directory /etc/xdg/autostart/, ~/.config/autostart/
Use /usr/bin/gnome-session-properties to set session properties (e.g. autostart programs). Those changes are specific to a user.
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