Wanted: Queueing system for automated access to lab workstations

[Anne Louise Gockel]

We are looking for a system that can be used to provide access to an unmanned
undergraduate lab of Sun workstations.  The system should manage a queue of
incoming students and force a student off of the console when his or her time
allotment has expired.

Does anyone know of any systems similar to this?

Ideal features:
        - manage a queue of incoming students and 30+ workstations
        - when lab has 70% of the seats occupied, enforce a X minute time limit
                on console access
        - when time limit has expired, give console user a 5 minute warning
                and then force user off
        - ignore remote login access (or maybe this can be an option?)

This system can either be some sort of front end to /bin/login or a daemon
running on a trusted server.  If you know of any system similar to this,
please send me the details.  I will post a summary of any promising replies.

                                        -Anne Louise Gockel
                                        Cornell Computer Science

Internet: alg at cs.cornell.edu            UUCP: cornell!alg