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Metro-style apps are borderless and occupy the full screen. If your display has a resolution of 1366 by 768 or better, you can snap a Metro-style app into a skinny strip along the side, with another one occupying the remainder of the screen.
When multiple Metro-style apps are open, you use another gesture—a quick swipe in from the left edge of the screen—to switch between apps. (The familiar Alt+Tab and Windows key+tab shortcuts work as well.)
Of course, you can use the familiar pinch gesture to zoom in or out in photos, web pages, and other places where that option makes sense.
If you tap a finger anywhere that accepts alphanumeric input, you’ll see an on-screen keyboard like the one shown here. Windows 8 bears a striking number of visual similarities to the Windows Phone OS.