A method, computer program product, and system for alerting authorities during a car theft. A personal identification number, either a normal code or a duress code, is received into an vehicle security system. If the duress code has been entered, then the security system is disarmed, wherein the vehicle...http://www.google.co.uk/patents/US6833785?utm_source=gb-gplus-sharePatent US6833785 - Vehicle security system
