Master key systems often use pin tumbler locks.
Master key for all door locks.
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In an office building for example each employee can have their own key which unlocks the door to their office.
The headmaster would have a key to all 200 locks and the caretaker would have a key to 199 locks to exclude the headmasters office.
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To allow for entry using your original and master keys change the pins in the lock mechanisms in each door.
Keyed different is the standard keying default on master lock and american lock door locks.
The drawbacks are that anyone with a key will have access to your entire home and all of the locks will need to be rekeyed if a key is lost.
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Keyed alike ka all door locks in the set are opened by the same key.
Once you have weighed the pros and cons and decided whether or not you want to have all of the locks in your house keyed alike call all american locksmiths.
Pin tumbler master locks use a master wafer pin in between the key pin and the driver pin.
At the same time more than one key can open the same lock.
Use the key in the kit as the master key.
In short a master key system allows one keys to open multiple different locks.
You can open each lock with its own key or card and the master key or card.
You might then have the science building with 40 locks.
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Kwikset makes a rekeying kit that includes all the parts and tools you need to create a master key.