The first step, after entering the Windows 8 system, right click on the desktop to select "screen resolution" to open the screen resolution window. If you have an external monitor, you can see a "multiple Monitor" item, where you can set the display in the dropdown bar.
Step two, "copying these displays is the same as the main screen on the second screen," Extending these displays "is a mosaic of the main screen to show more content," Only show Desktop on 1 "and" Show Desktop only on 2 "is displayed on only one screen.
The third step, in fact, there is a way to set up multiple screens, this way more intuitive. Bring up charm Bar in the lower right corner of your mouse screen and select devices, and the option "second screen" will appear if you have an external monitor attached.
The fourth step, then click on the "second screen" can be several options, the same is "computer screen only", "copy", "extension" and "only the second screen", but this time with the icon hint, can see what effect.