I'm not sure why it matters whether or not Mr. Hothead is running the server or not. How, when I'm using NAT, would you be able to see my internal IP (other than by using a cookie - not sure how that would even work)? If you can, I would like you to explain that. And if so, I would like you to explain how it matters whether or not you're running the server (and I really mean that... the more days go by, the more I realize I don't understand this stuff...).
If the hothead ran the physical server all bets are off. You connect to one of my servers and I know your internal IP even if you use NAT, your browser, your screen resolution hell If I wanted I could tell how much disk space you have. I'm guessing that the hothead posted A session cookie trying to look cool