In some case, you may need to show your desktop by single click or single shortcut. By keyboard shortcuts and simple mouse click, you can minimize or maximize windows of software or applications. In Windows Vista, Windows 7 and 8, there is an option on screen corner to show desktop by minimizing all applications.
You can use shortcut keys ‘Window key + D’ instead of this mouse click shortcut. In some software, games, you cannot minimize them. Here you can use this shortcut.
If you use these shortcuts, then all open software will minimize, then if you use above shortcuts again, then all application will revert as open.
Another shortcut is ‘Window key + M’. If you use this shortcut, all open applications will minimize. Difference between this shortcut from above shortcuts is, here if you use this shortcut (Window key + M) again, then all open applications will not revert as open.