The beautiful double starter.
If you have a Remote Desktop window opened up, try hitting the start screen in it.
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Also, there's a key on your keyboard that does that task quite admirably even in RDP sessions.
And note that in the Metro RDP app (which I actually quite like), it's impossible to use the corners because they will always belong to the host OS. The remote OS's functionality can be accessed via the keyboard and a toolbar in the RDP app, though.
I'm not sure if that's the case with the desktop RDP client. It's not with the metro one, in any case, because Metro apps can't take over the corners.
@Sven Groot:That means when I design full screen Metro App, I can't place interactive control on these corners or users might have problem pressing it.
A bit troublesome because when taught UI design, I'm told to place the most important actions to the corners and the center of screen. To cater with hot corner will make the Apps to lose the corners.
@cheong: You can place interactive elements in the top-right and bottom-right corners, as the action for those corners (bringing up the charms bar) doesn't block those corners and doesn't prevent you from clicking them. Top-left and bottom-left would be problematic, yeah (this is actually a problem I sometimes have with the app switcher blocking the back button in IE because I hit the corner trying to click that button).
Of course, when using touch it's gestures, not the corners, that activate those actions. And in a touch UI Fitt's law doesn't really apply anyway, and regardless of what MS may claim metro apps are designed for touch first.
Corners are normally disabled while you run a desktop app in full screen mode, fyi.