I understand that ad_sign can be used to create a unique key between form and form post. No two form posts have the same key.
This can be handy for posts that activate procedures/callbacks that have a delayed response between call and termination, where one does not want multiple processes activated on one record/key.
Anyway, I'm sure we'll want to find a standard way of handling a more strict double click protection and can start a different thread when we get to that point.
