retain last username used

On some of our workstations, when the Netware 5 login screen appears, it will “retain” the last username entered, while on others, it stubbornly holds onto a username that may not have been used in the past weeks (or months). Example: If I have logged into a machine with an administrative name, logoff, and then have UserX reboot and log in with his name, my administrative name is retained in the login field, regardless of how many times that person logs in.

How do I have it “remember” onlythe last username?