The DISPLAY command performs a variety of functions. Its major
    function is to show the contents of the specified screen
    displays. Each specified display is placed on top of any other
    displays that occupy overlapping windows on the terminal screen.
    The specified displays then become fully visible and any displays
    they overlap are hidden.

    You can also use the DISPLAY command to change the attributes
    of the specified screen displays. You can create displays that
    do not appear on the screen, you can change their sizes, you can
    clear their contents, and you can change their window locations
    and display kinds.