Can anyone shed some light on how this activation code is implemented? I want to limit the number of registrants and track the time they registered, so their access can expire a fixed time after they first register. Thank you.

Could you explain this a little bit better?

You mean that you want to delete or suspend the user after a certain amount of time after his registration? Or to disable the users that registered using the activation code after a predefined period?

thanks.

bye,
Giovanni.