功能是关闭显示器，按Ctrl+Alt+Delete可以再打开显示器。这个是为那些显示器没自带关闭键的电脑设计的，在作者机器上能正常关闭显示器。-Feature is turned off display, press Ctrl+ Alt+ Delete to re-open the display. This is for those who do not own close button displays the computer-designed, the author can be a normal shutdown of the machine on display.