How to restrict logon

Hello I am a technician for the library system, we have 2 logons without passwords milguest and milcat. Also we have certain computers for those logins.

We want to restrict the milcats logons from signing into the milguests computers, is there something locally that can be done without using GPO.

Because milcat is highly restricted only for catalog use, but we noticed users been logging out of milcats computers, and signing in milguest computers.

Any help is appreciated.
Thanks,
Chad