You can use two Windows machines at once with a single keyboard and mouse without any special hardware. I had an extra laptop lying around that now connects with the same keyboard and mouse as my PC.

After decades of working with computers, I started to develop some wrist and arm pain a few year ago. So I switched from using whatever random mouse I could find for under $20 to using input devices ...

There's nothing wrong with using your laptop's touchpad. In fact, you can fine-tune your experience by learning a few nifty touchpad tricks like making custom gestures or changing cursor speeds. Yet, ...