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Why not just use the CGI Enviornment Variable REMOTE_ADDR to ensure that they this IP has not voted previously. IPs that vote could be stored in a file which could later be parsed to ensure that that IP has not voted. If they have not voted, it would allow them to, and if they have, they would receive a message such as "You have already voted from this IP."
Apterigo

In reply to Re: Quick and easy way to prevent multiple votes? by Apterigo
in thread Quick and easy way to prevent multiple votes? by Anonymous Monk

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