$_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.
404Search is adware targeted at 404search.com. It uses sites controlled by the Kanoodle search engine.
The 404search engine uses an IE BHO named 404search.dll.