Alternate Views

>>>    CTRL-TAB

An alternate view is a view that displays the same relative area but from a different perspective or angle.  If a view has alternate views defined, you will see >>> in front of the title of the window.

Here CTRL-TAB is pressed to show the alternate view which shows the other side of the door.  Pressing CTRL-TAB again will continue to step thru any defined Alternate Views.  In this control, it would go back and forth to both side of the doors.