The feature I liked most in Windows 8 is App bar and Charms bar, because they take all the relative functions for all apps at the same place and once you know that you will find app/context/selection specific options in app bar and common options in Charms bar, everything works smooth. Hope this video will make the conception of apps bar and charms bar clear. Actually realized them when learning Metro design principles for Windows 8 from MSDN for designing an app.
[YT]http://www.youtube.com/watch?v=PMc92O7VbPA[/YT]
[YT]http://www.youtube.com/watch?v=PMc92O7VbPA[/YT]
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