Abstract: A management apparatus for a locking system includes a computer memory, first computer means for listing in the computer memory the doors having the locks of the system, and second computer means for entering data in the computer memory defining the interrelationships of the doors, which data including the doors of the system which are accessed by other of the doors. A third computer means lists in the computer memory selected ones of the locks of the doors to be operated by each of the keys, and a fourth computer means determines if a path exists according to said data from an outer limit of the locking system to each of the doors selected for operation by the key either directly or via other of the doors selected for operation by the key. Another means determines if an external door or external doors of the system provide access via a path either directly to each of the internal doors or via other of the internal doors of the system to each internal door of the system.