An original blanking period of a video signal is shortened to a set blanking period, and audio data is multiplexed into a resulting superimposing period. Later inputs on the portable computing device are displayed in a scrolling fashion on the second computing device with later input being displayed below previous input without regard to the location of the input on the portable computing device. Argon discharges can be sustained at atmospheric pressure with voltages as low as 260 V for cathode-anode gaps of 0.