Also, you will not be able to view their accounts because the script will grab and use your IP address. You could create a log of the IP addresses and then manually search the DB(s) or save a log of every search.
Well, both require different methods to prevent...
If you need to prevent same person having multiple accounts, just check for those with same IP address. If you need to prevent same account being shared by people, then you will have to log each IP and check if there are 2 different IP logins simultaneously.
Before providing you with more precise solutions, which are you actually trying to prevent?
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