I'm always glad to see PLATO getting its due. We had a PLATO terminal in our house - beautiful wood frame with an orange plasma screen, hardwired in to the University of Illinois mainframe at 1200baud. Besides remembering playing a lot of Empire with the college kids, there was also a cyber-nanny called "The Enforcer" which admins could place on "educational" accounts to limit access to games at certain hours of the day (or if games were taking up too many resourced on the mainframe.) My Dad used The Enforcer as a very effective incentive to get my homework done.