https://www.gnome.org/wp-content/uploads/2010/09/activities-overview-940x529.pngOn GNOME 3, RHEL 7, how can I create a button that can be very easily reached with the mouse (only 1 click if anything is open), that can bring all the open windows to the taskbar? Like a show desktop icon on GNOME 2 or in Windows. 
Show desktop button for GNOME 3
gnome3;desktop