Contains instruction in laptop ideas, data systems, networking, operating techniques, laptop hardware, the Web, software functions, help desk ideas and drawback solving, and ideas of customer service. The US Military requested Bell Laboratories to design a machine to help in testing its M-9 gun director, a kind of analog pc that goals large guns to their targets. Mathematician George Stibitz recommends utilizing a relay-primarily based calculator for the challenge. The outcome was the Relay Interpolator, later called the Bell Labs Model II. The Relay Interpolator used 440 relays, and because it was programmable by paper tape, was used for other functions following the battle.