How to switch Win8 "second screen", when our Windows 8 computer external to other display devices such as monitors or projectors, we can press the combination shortcut key "Win+p", Win8 the right side of the desktop will appear to the left "second screen" control interface, you can in the "computer screen only , "Copy", "Expand" and "second screen only" flexibility to quickly select the display mode for presentation, quick and easy.
You may find this interface familiar and unfamiliar ... Yes, this is basically the same as the Win7 system, except that the WIN8 system uses a more Metro-style interface and replaces the previous "projector" with a "second screen".
"Computer-only Screen" mode, the notebook is working properly, the screen information is not output, the external device does not display the computer screen picture. We do a lot of things when we do the projection preparation, such as choosing PPT, setting the screen and so on. These operations we do not want to enlarge on the projection to let others see, choose this mode can be.
"Copy" mode is to let the notebook screen and the second screen to display the same content synchronously, this mode is particularly suitable for demonstrating software operations.
"Extended" mode allows external devices to display the expansion screen, for example, we can display a larger screen with two screens and so on.
"Second screen only" mode is the simplest, just display the screen in the projector and turn off the computer screen. If you use a notebook, you can save power for your laptop.
If your current Windows 8 computer is unable to use the second screen, you are prompted to "your computer cannot be projected to another screen." Try reinstalling the driver or using a different video card. "
Transferred from: http://product.pconline.com.cn/itbk/software/win8/1207/2858604.html
WIN8 Toggle the second screen what shortcut keys