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I'm hoping these are linux systems here...
Have an sshd client automatically run on all the computers in an ip range for the room. Then using open source remote ssh login code connect and then write the logins to the computers logging them into the network and starting x. (Note: Very insecure, hackers will have a field day and get classroom pass, make sure it's not that important to keep secret. Maybe even lock down the user account at certain times of the day.)
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