The old ones are not really disabled in that sense. They are not changed at all. What happens is that any new ones, or old ones, are reprogrammed along with the transmitter/receiver in the vehicle at the same time. Some vehicles allow one time programming, after that the fobs can't be changed again. Probably not that way on the Ford. New Dodges with the keyless fobs are that way.
Back to the question: The "codes" that allow the fobs to communicate with the vehicle have to be changed all at the same time along with the receiver in the vehicle. It "re-writes" over any previous information. Any existing fobs are not changed if they aren't present, thereby disabling them for that vehicle.
I know, a long explanation for a simple result. Hope it helps.
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