Win8 corner hot zone function

The new version of Windows 8 cancels the start menu, but you can still enter the Metro interface when you click the lower left corner with the mouse. In fact, the remaining corners have similar functions.
For example, the top left corner represents a loop between open Metro apps, the upper right corner means that the Charm toolbar can be activated with one click, the lower left corner is the switch between Metro and traditional desktops, and the lower right corner means that all open programs are minimized. (Metro group represents global display of Metro grouping).