Several ways to exiting a Modern UI app in Win 8 .

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Several days ago i saw one of my friend do some work in his laptop . Every time he want to exit the full screen app ,he will send Ctrl+Alt+Del to the machine. Is it the right way? Of course not , the answers are as follows , very easy , but hope to help somebody :

• Use the keyboard. Alt + F4 still works like a charm
• Use the top edge:
  1. Move your mouse or finger to the top of the screen {except for the top left extreme and top right extreme}
  2. Click/tap and drag to bottom of screen. The app will close when you get to the bottom.
• Use the left edge: Bring the cursor in the very top (or bottom) left corner of the screen then move the mouse against the border up (or down). Now you can:
  • Middle click any app to close it.
  • Right click any app to show the contextual menu, with Close being an option.
  • Drag any app left onto the current app, then without releasing bring it to the bottom to close it

Please note that in Windows 8, in some cases apps are not supposed to be closed. This is part of the general Modern UI experience; however, because of popular demand, Microsoft did add this feature in the consumer preview.

See Microsoft's official video on mouse usage in Windows 8 here. Also a good video to watch is the touch video.