Everyone has a mouse (or mouse-like device) on their computer, as well as a keyboard of some type or another. But what if that’s just not enough? Maybe you need a bit more? I’m not quite sure exactly what else you need, but if you’re so inclined it is possible to hook up an alternate input device to your serial port. The author of the page states that they’ve hooked up a footswitch to their computer. I’m not sure what for, exactly, but extra gadgetry is always cool, right?