Using this system variable you can make a selection of overlapping objects very easily. When
the value of this system variable is set to 2, an overlapping icon and a menu containing a list of
overlapping objects appear and you can select the required object from this list.
If you set the value of this system variable to 1, only the overlap icon appears not the menu. You
can turn this off by changing the value of this system variable to 0.
