Another new feature, the keypad entry system, allowed access to the vehicle via a factory-programmed (or self-programmed alternate) five digit combination. From the keypad, you could lock all doors, or, after entering your code, unlock the vehicle's doors or open the trunk lid. With this system being linked only to the vehicle, rather than a satellite, the need for drivers to share their identity with an operator in a potentially unsecure environment is not required. This popular feature is still in use on many Lincoln, Mercury and Ford vehicles.