


Inside a master key system, groups of locks can be keyed alike, so that the same key operates all locks in the group, plus all locks in the group are operated by the master key. These locks would be described as keyed alike and master keyed.
Under the master, groups of locks can be keyed different, keyed to a submaster, and keyed to the master. For example, you might have three buildings. Each building has six locks keyed differently and a submaster key that operates all the locks within a single building. The master key opens all the locks in all three buidlings, but the submaster from one building will not open any lock in either of the other two buildings.
A grand master key might be necessary if a property manager is responsible for groups of buildings, for example. Each group of buildings would be under a seperate master key; each building would have a submaster key; and overall would be the grand master key that would open everything.

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