How to reset Keyless Entry code?

I just bought a 2001 Crown Vic LX with the keyless door entry. The manual says to enter the factory code, then go about your business of changing codes, etc.
The dealer did not have the original factory code information (bought from a Toyota dealer that took it in on trade I suppose).
Question: Is there a way, with the key in the ignition or otherwise, to reprogram / reset the code to allow keyless entry via the keypad?
Thanks
Fred
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[This followup was posted to alt.autos.ford and a copy was sent to the cited author.]
snipped-for-privacy@tds.net says...

You cannot change the factory code, it's permanently set. You may need to look around to find the label that lists the code. Some areas to look: Underneath the trunk lid area, under the dash next to the brake.
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open the trunk, and the code will be on one of the lid hinges. it is a 5 digit #
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