A:AnswerGreat question, Surface Pen is compatible with Adobe Lightroom. If you're interested in learning about which apps work seamlessly with Surface Pen you can do so here: https://aka.ms/AA4r437.
A:AnswerI believe it does. On top of the Surface Pro I bought alongside my Surface Pen, I also own an HP Pavilion touch screen laptop and the Surface Pen works with it as well (running Windows 10).
A:AnswerYes! This pen can replicate anything you can do with a mouse. You can select, copy, paste, and highlight just as you would with a mouse in any app that allows it.
A:AnswerYou could ask one of the blue shirts at Best Buy. This pen is designed to be used with a Surface, so maybe not compatible with other brand computers.