Windows 8 Developer Preview – how to select between “Metro” IE and “Desktop” IE

I do not believe this is possible. While, starting in the Release Preview, you could move apps that run in the interface formerly nicknamed Metro, from monitor to monitor, Windows 8 still, by design as I understand it will only run that interface in one monitor and all other monitors will default to desktop mode.

While a reading of the Building Windows 8 blog seems to hint at how you can use these apps on any monitor, you will notice that in all of the examples shown, the interface formerly known as Metro only ever shows up on one monitor and the other(s) all show desktop mode.

Paul Thurrott has an article which elaborates on this a little bit more.

Note: Microsoft has announced that Windows 8.1 will have the ability to run Metro apps on multiple screens at once. Windows 8.1 will be a free upgrade to Windows 8, and is planned for release this fall.

No. Metro is exclusively single-monitor (one of the worst things about it, IMO). This is most obvious if you launch an app on one monitor and then go to bring up the Start Screen on your other - it closes the app that was up on the first monitor!

The only way to do this would be with something like EyeFinity, where you trick the system into thinking your displays are one very large display - but that changes the behavior of other things in ways you might not like.

(Just be glad you only have two monitors - trying to hit the corners to bring up the charms bar is almost impossible when you have a two-by-two or larger array of monitors.)