Multimonitor support in Windows 8 desktop is really cool. It's like having three independent displays, rather than one or two slaved off a primary. Corner peeks and charms can be used on all three monitors, for example. The taskbar appears on all three, with all the taskbar shortcuts available.

Also, different background images are shown on the different displays.

The only thing not present on secondary monitor taskbars are the notifications on the right side.
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