Workstation Logon 9x

Setup the workstations to use a static IP address. Then in the NT server console, go to "administrative tools" and go to "user manager for domains". Select the username and double click. Here you can change the password, etc., click on the icon "logon to" at the bottom. Enter the IP address for those workstations and click "ok".
That user will not be able to logon with that name at any other workstation except the ones specified.
I hope this solves your problem or it helps.

That's not an easy thing to accomplish in a Win9x environment. The second answer given only works for up to 8 machines and, as far as I know, only works for computers that participate in domain security (NT Workstation and Win2000 Professional).It seems like it should be possible to set an environment variable or registry key on each workstation and have the logon script check for it and exit from the logon process if it's not present. You do have to be careful about how you exit, though,because by the time the logon script runs, the user has already been authenticated so you have to log them off rather than just exiting from the script.

It occurs to me that it may be possible to do something with the System Policy editor but that's outside the range of my expertise.

paul