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Just about every Microsoft service that Longhorn touched was going to be given the Longhorn UI treatment, including Live services. The screen shot above demonstrates that reach and showcases how it could, in theory, work to create a seamless Longhorn experience.
The advent of Windows Flip was a Longhorn-based implementation of Alt+Tab. Not only were you shown thumbnails while you tabbed through your selections, but all the selections would show in larger windows in the background, thus allowing you to see even more clearly what you were selecting through.
Windows Flip was a 2D visual effect, but with the most demanding version of the Aero theme enabled, one could enjoy Windows Flip 3D: a feature that still exists in Windows to this day. Instead of Alt+Tab, pressing the Win key + Tab makes all running tasks fold back into 3D stacks you can scroll through. It's primarily a flashy effect, but when it was first mocked-up, it was a nice change of pace that fit well with the Longhorn vision.