“‘Tempest for Eliza’ is a program that uses your computer monitor to send out AM radio signals. You can then hear computer generated music in your radio.
“All electronic devices send out eletromagnetic waves – so does your monitor, and your monitor does it all the time at very high frequencies. They are high enough for your shortwave AM radio. All you have to do is display the ‘correct’ image on your screen and your monitor will emit the ‘right’ signals.”