$_SERVER["REMOTE_ADDR"] = preg_replace('/.*,\s*/','', $_SERVER["HTTP_X_FORWARDED_FOR"]);
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Program that delivers advertisements on your PC.
Note that many websites have their own advertising, unrelated to adware.
Showbehind website claims "THE SHOWBEHIND NETWORK WILL BE OFFICIALLY CLOSING BY NOVEMBER 1st, 2004"
Steps included from the vendor at http://www.showbehind.com.