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The access code is also used for authentication. In telecommunications, an access code is required before a user can be connected to a specific region. National access codes are used in dialing domestic numbers, while international access codes are used in dialing international numbers. A PIN is also a sort of access code that is shared between a specific user and the system.
Access codes are also used in digital systems, behaving like a locked door to limit access from the outside world. A person must have the key to gain access to the system, which is the access key or code.