In order to create a shortcut that shows the desktop you can create a shortcut in the quick launch section. Here is how:
1. Open the quick launch folder.
2. Create a new text file.
3. Copy and paste the following text in to the new file:
[Shell]
Command=2
IconFile=explorer.exe,3
[Taskbar]
Command=ToggleDesktop
4. Save the file.
5. Rename the file to “ShowDesktop.scf”.
Note! .scf files are used for Windows explorer commands.