mindow minimizes all opened windows to show the desktop.
1.) xdotool 2.) xwininfo
1.) Save mindow file to "/usr/bin" directory. 2.) chmod +x mindow 3.) Assign hotkeys to run mindow such as, "ctrl+shft+m".
mindow will minimize all opened windows by searching the window stack until the only active window is the Desktop.
Mindow has only been tested in Manjaro 16.10 LTS using xfce4 desktop manager.