We pry open a copy of Microsoft's first public release of Windows 8.
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The Devices side menu typically looks like this, at left. It will vary depending on the hardware you have installed. Click Display and you see what's on the right, a list of choices for how Windows 8 should handle a second display. I tried to hook up a second monitor to see if I could run both Metro and the legacy Windows UI. It didn't behave as I expected. Once you connect them up, I tried letting one display run the legacy desktop and the other run Metro apps. You swap them by clicking Start – if two displays are on, the Start button turns into a Swap Displays button. But when I did it, I found the hover menu no longer would appear. That means anything you normally would invoke through hover has to be available through other means.
Also, when I tried to invoke legacy apps by, for instance, launching something from the Launchbar, the Metro Start menu vanished. An extended version of the desktop replaced it. So far, anyway, I couldn't easily lock the Metro view on one display and have the legacy view on another.