Login in problem

I have about 50 users, using Novell. And a couple of users are having problems logging in. On most PC’s Novell remembers the last user name to log in, but on some machines a particular username is stuck, and the user has to change this everytime he/she logs in.
Can anyone point me in the direction of a particular setting whereby I can make these machines, remember the last user name, used to login
Much appreciated

Neil Hughes