* You would equip each computer with a walkie-talkie.
* You would give each computer a way to set whether it wants to transmit or receive.
* You would give the computer a way to turn its binary 1s and 0s into two different beeps that the walkie-talkie could transmit and receive and convert back and forth between beeps and 1s/0s.
This would actually work. The only problem would be that the data rate would be very slow. A $5 walkie-talkie is designed to handle the human voice (and it's a pretty scratchy rendition at that), so you would not be able to send very much data this way. Maybe 1,000 bits per second.
look at how things work, they have a section on that. Wifi is pretty much the same thing as what you're talking about, just at much higher frequencies.
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