Now a master keying program for those locksmiths who are not interested in cross keying or multi-dimensional master keying. The user chooses the manufacturer, the quantity of chambers, the grand master or can let the program create a random grand master. Then choose the quantity of master keys, the quantity of sub-master keys under each master and while these choices are being entered, the program will provide the total quantity of change keys available. When the choices are complete, click the OK button. The program will then generate the master key system starting with the cover sheet which describes the system. The second page includes the key bitting array (KBA) and an enlarged KBA which includes the pinning for each cut. Then the page(s) of master keys and sub-master keys and then a listing of the change keys. The program comes on CD.