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If you swipe from the left side of the screen to the right, your desktop will appear -- and this gives you an idea of how it comes about. The Start screen stays there constantly, just in the background out of sight -- same to the desktop. The desktop will slide in from the center-right and glide in beautifully.
A quick look at the weather application: it's simple but it's effective. Note that the wallpaper is not per se, but a video, and very similiar to that of 'DreamScene' in Windows Vista. The whole application is full-screen and designed with tablets in mind.
When the location is typed in and entered, the entire application reflects those changes -- still with a moving wallpaper. In this case, the moon rotates and the light spins around it. This is just an example of what a Metro user-interface application looks like and feels like to work on.