A password anti-theft system for a multiple-apparatuses system, in which a central apparatus has at least one peripheral apparatus connectable thereto. When the peripheral apparatus is connected to the central apparatus, entry of passwords respectively peculiar to the central apparatus and the at least...http://www.google.ca/patents/US5111185?utm_source=gb-gplus-sharePatent US5111185 - Password controlled anti-theft system for discouraging theft of a multiple-apparatus system
