Is there a keyboard shortcut to fully hide all windows, showing only desktop? Is there a keyboard shortcut to fully hide all windows, showing only desktop?

(I know that the trackpad gesture four-fingers-up will sweep them all out of the way, i think it's an expose function. I was hoping for a full "hide" of them all instead.)

thanks!
⌘+H Hides the windows of the currently running application.

⌥+⌘+H Hides the windows of all other running applications.