I am looking for the best way to keep someone from registering in a sweepstakes only once. What do you all recommend? I was thinking of using a GUID but these are machine specific, right? I was also thinking of making it so that when they enter their information I can check it against the database and if there is a match, let them know they already registered. But then again all they have to do is start over and enter information again. Maybe using a special code or something?
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