Also you could have put this in a form that the user can read, example, Internet Explorer 6, or FireFox. Because not everyone know how to read things like: Mozilla/4.0 (Compatible, MSIE/4, Windows NT 5.1)
You can take this a step further to make it detect Googlebot, Yahoo! Slurp or msnbot. This would be useful for blocking the Search Engine bots from clicking particular links on your site.
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