Usage
Hide windows via the hide keyword.

↩ Hide all windows except the frontmost. ⌘↩ Hide all windows including the frontmost.
Show windows via the showall keyword.

↩ Show hidden windows. ⌘↩ Show hidden windows and minimised Finder windows.
Hide windows via the hide keyword.

↩ Hide all windows except the frontmost. ⌘↩ Hide all windows including the frontmost.
Show windows via the showall keyword.

↩ Show hidden windows. ⌘↩ Show hidden windows and minimised Finder windows.