kdm - shows all user on login screen

Hi List, is there any thing I can do to suppress the listing of all system known users on the logon screen of kdm. I think it is not a good idea to give the people a clue as wich users they might login. thx andy -- ------------------------------- mailto:Andreas.Tirok@beusen.de fon: +49 30 549932-37 fax: +49 30 549932-21