gdm: gdm (GNOME Display Manager)
gdm:
gdm: GDM (the GNOME Display Manager) provides an alternate display manager
gdm: for the X Window System. The X Window System by default uses the XDM 
gdm: display manager. However, resolving XDM configuration issues typically 
gdm: involves editing a configuration file. GDM allows users to customize 
gdm: or troubleshoot settings without having to resort to a command line. 
gdm: Users can pick their session type on a per-login basis. GDM also 
gdm: features easy customisation with themes.
gdm:
gdm: