The key fobs can be programmed for driver + vehicle, if you do it this way; that driver will be tied to that vehicle. The other option is to simply program that keyfob to a driver or vehicle only.
Speaking of programming; to make the act of assigning each fob to a driver/vehicle, a keyfob reader/programmer is available and can be used right at your computer. You simply touch the fobs to the reader and a serial number is assigned to that that driver/vehicle.
Should you choose not to get that reader/programmer, keys can be programmed at the head unit but be aware that it does take extra time and you must be at the head unit to program all your keys.
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