If you have multiple Windows open and want to clear your desktop instead of click the desktop shortcut, this tutorial will show you how to.
For reference, this is the title bar:
To minimize all the other Windows, click and hold the Title Bar of the Window you only want open. Shake the Window to the left and right.
When the Windows are minimized, let go of the left mouse button.
To Restore the Windows, simply, shake the open Window again.