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Master key systems are useful for commercial buildings and apartment buildings where there are multiple locks involved. Master keys are single keys that have the ability to open every lock it is keyed too. Each lock also has its own key that doesn't work on any of the other locks. It is important to have a Master Key System so there are no keys that are accidentally cross keyed. Cross keyed keys might accidentally open a door that it shouldn't. A master key system keeps track of all the keys in the system so new keys can be created under the Master key.