Is the pen as mighty as the touch? The Touch8 Smart Pen being shown here at CES 2013 is a stylus that works on non-touch screens, but it's not a pen without problems.

Electromagnetic interference can turn a plain LCD into a touch screen on the cheap.

What Comes After the Touch Screen? Gesture control, devices that recognize different people, and tricks to make a screen feel as if it has physical buttons could be coming to your gadgets.