A type of lock having an inside release bar. When depressed, the release bar (called crossbar, push pad, etc.) retracts the latch bolt, thus permitting the door to be opened. Most codes require that the activating portion of the release mechanism extend not less than half way across the door. A dogging device allows the release bar to be locked down so that the latch bolt remains retracted and the door can be used as a "push-pull" door. They may or may not be key operated from the outside. These devices have been investigated for panic and are listed by a nationally recognized independent testing laboratory and are also under in-plant follow-up inspection service. They may not be used on fire doors.