first. not to be lame, but... P.A.T.S., V.A.T.S., passlock, passkey, ect. are basicaly not much different. If you don't know what to call it because you don't know much about cars or trucks, ... thats ok, everybody, including me was there once... It is called a .."TRANSPONDER BASED SYSTEM"... I didn't need to go through auto. school and years of expirience to tell you that, even though I did, mabey,,,just to tell you that. Now I'm NOT trying to be a jerk or p@@@ anyboy off but this is my first day on this and I don't get on comp's. very much but I do know something about automotive technology.