For most people, the security of their place of residence and job is paramount, and is irreplaceable. Commercial establishments and other facilities are open during the day when people work and customers enter.
This meant that the door had to be opened for people to enter. However, some doors only allow authorized people to pass through. For this reason there are access control systems specifically installed to check incoming people.
Access control mechanisms can be physical or electronic. The door can be locked manually to prevent outsiders from entering the restricted area. The computer system can be used to activate the electronic locking system.
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