The Image/Mask Display and Edit Area is the main
  display and work area of the Screen Editor.

  Benchmark and Result images, and differences between
  Benchmark and Results are displayed in the Image/Mask
  Display and Edit Area of the Screen Editor.  The
  Image/Mask Display and Edit Area is also used to
  display and define Masks.

  For more information about using the Image/Mask Display
  and Edit Area double click on an item from the list of
  additional topics below.