Don't know if this is possible with any flavor of Windows, Mac or Linux OS, but sometimes I wish I could attach two mice to my laptop. I often have a bunch of Finder windows open on one screen (external monitor) while working on coding and previewing my app in another screen. But to move the mouse all the way over from one screen to the other screen to open a file, then move the mouse all the way back to the screen where I've got my editor open to get back to coding. It wastes movement and precious time before my daily wrist fatigue sets in. It'd be great if I could add another mouse with an independent mouse pointer. Or even better ... a specialized mouse could be equipped with a simple toggle switch to alternately switch focus between two mouse pointers. This would allow the user to quickly navigate between two screen.