Neither of the Init, PreSession or PostSession scripts are necessary and can be left out. At least one session script is required for proper operation. Determines whether gdm should kill X clients started by the Init scripts when the user logs in. Default is 1. By default this is the same as the ServAuthDir.
Full path is required.
Directory containing the X authentication files for the displays. Should be owned by gdm.gdm with permissions 750. The username under which gdm is run. The directory where user's .Xauthority file should be saved. If gdm fails to update user's .Xauthority file for some odd reason a cookie is created in this directory.