keying locks alike

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Answer
Von Duprin does not supply cylinders keyed alike.   Cylinders keyed alike are available from Schlage and Falcon.
When you want to periodically disable and block access to a certain room in a building or an entrance door, that’s when you would need to use a Lockout Cylinder. See full document.
All lock cylinders on a specific project are operable by a special "project key".  Duplicates of this key may be assigned by the building contractor to workmen and subcontractors as required...