[Samba] two questions about samba

[Jack Mendez]

I would like to deny users access to the pdc based on the hostname.
so if username1 logs into computer1, that is allowed, if the user logs of,
and goes on to computer2, it will be denied because computer2 is a staff
machine
we have students that will sometimes try to use staff machines and i want
the login to fail.
i have lots of log entries that look like.


[2007/06/21 15:44:44, 0] auth/auth_util.c:create_builtin_administrators(785)
  create_builtin_administrators: Failed to create Administrators
[2007/06/21 15:44:44, 2] auth/auth_util.c:create_local_nt_token(899)
  create_local_nt_token: Failed to create BUILTIN\Administrators group!
[2007/06/21 15:44:44, 0] auth/auth_util.c:create_builtin_users(751)
  create_builtin_users: Failed to create Users
  create_local_nt_token: Failed to create BUILTIN\Users group!
the system is working fine but the logs are filling up with this data.

ideas?