The method and apparatus for using pager technique to monitor the opening history of important door feature that a pager lock is installed to the door and more input instructions for the door are stored in computer of pager station for giving out both door-opening command and output display signs that can be displayed on BP of door master for understanding who is opening the door. Said output display signs are also stored in memory of pager lock for door master inquiring, so increasing safty and security. |