GDM configuration?

I would like to \dd xfce4 to my gdm login options but can't find out how to do this - the YaST tool doesn't seem to apply to gdm and gdmsetup doesn't include options to change the session types. Could anyone show me how? John -- John Pettigrew Headstrong Games john@headstrong-games.co.uk Fun : Strategy : Price http://www.headstrong-games.co.uk/ Board games that won't break the bank