A lockdown (literally: lock or lock) is an emergency protocol that usually aims to prevent people or information from leaving an area. The protocol can usually only be set by an authority.
Lockdown can also be used to protect people within a facility or, for example, a computer system from a threat or other external event. In buildings, a lockdown usually means that doors leading out are locked in such a way that no one is allowed in or out.
A complete seal usually means that people must stay where they are and not enter or leave a building or rooms within that building. When people are in a hallway, they should go to the nearest safe, closed area.
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