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Have you set up your new PDA with the same username / profile of the old one? If so, you should be able to just sync all your data / programs, etc from the old PDA over to the new one. Just set up ONE TIME for "Desktop overrides Handheld" for all of your conduits. Your registration number should still be stored in your backup files on your PC.
Don't know if this will help based on the sketchy info you provide. Good luck!
Brent