There are numerous ways to show the desktop on Windows 7 and 8, and some new ones that are often overlooked.
How to Show your Desktop
The easiest way of course is to click on the “show desktop” bar, in the notification bar area next to the clock in the lower right hand corner. In this picture below, look at where the red arrow is pointing.
There is an often overlooked but really neat feature that is built into Windows 7 and 8. This feature is not included Windows 7 Starter or Home Basic,
Shake the Title Bar
By simply grabbing the Title Bar at the top of any window and shaking it side-to-side, you can minimize and maximize all the other open windows all at one time. The image below shows where to grab, and shake.
Other Handy Windows Shortcut Keys
+D. To restore minimized windows, press the Windows logo key +D again. +M to minimize open windows, and press the Windows logo key +Shift+M to restore them.