Abloy locking systems can be set up several different ways.
Keyed Different - Every lock is keyed to a unique combination.
Keyed Alike - Two or more locks can be operated with the same key.
Central Locking - Two or more different keys operate a common lock as well as individual locks.
Master Keyed - All locks are operated by individual keys and by a master key.
Grand Master Keyed - Locks operated by multiple levels of keys and master keys.