I downloaded an http server for free, and had it running off of my desktop. It was working fine, all I had to do was type in http my ip address and it would work. But then I found out that only I could access it; everyone else was blocked. Maybe my internet provider blocks it for security, but I wonder if all internet providers do so, or if there's some other way of getting around it. File sharing programs like Aimster and ICQ know the IP addresses of both parties, but the data transferred between the two doesn't pass through their servers. So I'm wondering how they link up the two parties, and if it can be done without them.
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