Yes, Windows has it by default, why not Mac? Well you can always push F11 to view the desktop, but what if you want a dock icon to do this? easy..
Open Apple Script Editor (Machintosh HD > Applications > System Utilities > Apple Script Editor)
Choose File > New
in the code window type
(* AppleScript Show Desktop *)
activate application “Finder”
do shell script “/Applications/Utilities/Expose.app/Contents/MacOS/Expose 1″
so you now have something like this:
Save this. File > Save As – “Show_My_Desktop”, change File Format to Application, check the Options box “Run Only”
Save
If that works you will not have an icon on your desktop like this:
Drag this into the dock, then click it. All done.
If you want it to look a little better, then change the icon. To do this read my previous post Change An Icon in Mac OSx
