Master key systems are designed to allow a single key open one door, groups of doors or any door with in the master suit system. It would start with either a common door or a group of doors. A common door would be mainly on the front of a building allowing all keys to open it. Individual doors would have a separate key for entry. There can be an overall key know as the master key in witch would open all doors giving control on all the key system.
If it were to say a hotel you could have a system set up like the following:
General Manager has a Grand master key to open all doors; Deputy Manager has a sub master key to open all doors except the manager’s office and the safe room. House keeper has a sub master key that will open all bed rooms, linen rooms except the general manager’s office, deputy manager’s office and the safe room. So basically you can build a master key suit to suit any building is it big or small.
Other possibilities with a master key system are where you can protect the key by having a registered key or restricted key system. A registered key system will allow only the registered owner orterized to get keys cut which will stop unorterized keys being available.
Further to that it would give more security knowing that you have complete control on the key cutting. There are many different variants of products available to buy under a master key system. Dyno locks locksmiths would use two, Multlock and a DOM system. The Dom system is very flexible and can be produced on a complex master key system.
There are many key cutting facilities available to include hardware, dry cleaners and heel bars that can duplicate keys for many different locks. However it is important to make sure that you purchase from the locksmith a master key system that is patent protected using a registered key system this means that the keys can only be cut by the agent who provides the system as they only have access to the key blanks and non agents have no access to the key blanks.