A retrofitted personal computer ("PC") has an access control module attached to the rear wall of the PC. A secondary switch within the access control module is connected in series between the main switch of the PC and the power supply. An authorized user remotely controls the powering of the PC by turning...http://www.google.fr/patents/US5925128?utm_source=gb-gplus-shareBrevet US5925128 - Access control module for a personal computer
