Networked computers are great. You can share files across a network. You can print documents across a network. You can play games across a network. You can do just about everything across a network, assuming, of course, that the network is your own and is completely under your control.But what if you involve a network that’s not under your control? How easy is it to copy a file from your school or work computer to your home computer, especially if that school or work computer is behind a firewall and your home computer is behind a NAT’d router? Not very.

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