Actually, I am thinking of one system
Pretend your using a desktop, the desktop monitors always show the desktop and win32 apps. Metro apps are possible but not by default, not while the device is plugged in.
A device that is essentially a thin screen, is attached via USB and sits next to your mouse, (or under it, if it can). This screen always displays the metro tiles and metro apps and win32 app launchers(as they show in the same list).
So this would be like having the start menu always open. You could tap the program you want, and if it is a metro app, it launches on that screen (unless otherwise configured) and if its win32, it launches the program on your desktop monitors.
This solves the inefficiency of the new start screen when using a mouse. And its not a big deal to arch my head and use a touch screen for a moment to launch a program.
Bonus points if it can function like a giant laptop touch pad or as a drawing pad to draw into a win32 app. Where moving my finger on the screen, moves my mouse pointer on the desktop. (again, for drawing, or people that hate mice and like touch pads)
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