If I understand correctly what you're thinking about, I would say that you do not want to do that, especially if you'll be using GET links (which is the only sensible way to do it). If I were a hacker-type I could just enter the URL into my browser as http://thisisasite.com/cgi-bin/browser.cgi?foo=bar&hiddenvalue=yes and it would be about that simple to gain basic access to things that you probably don't want me to have access to.