When a door is locked, only someone with a key can enter through the door, depending on how the lock is configured. Historically, this was partially accomplished through keys and locks. An access control system determines who is allowed to enter or exit, where they are allowed to exit or enter, and when they are allowed to enter or exit. Within these environments, physical key management may also be employed as a means of further managing and monitoring access to mechanically keyed areas or access to certain small assets.Physical access control is a matter of who, where, and when. Physical access control can be achieved by a human (a guard, bouncer, or receptionist), through mechanical means such as locks and keys, or through technological means such as access control systems like the. Of a shop (checkout) or a country.The term access control refers to the practice of restricting entrance to a property, a building, or a room to authorized persons.
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