Buy the screen, follow the instructions.
Seems simple. What some feel nonplused about is that it's not as neat as they wish. I've used such for point of sale and factory test software but for other use the feature is not something I would not pay for.
I was just wondering if it would be possible to hook up an old touch screen from a laptop to my desktop PC as a second monitor. Does anyone have any insight on how to go about doing this?