1    /CLEAR

    Erases the entire textual contents of the specified screen
    displays.

2    /DYNAMIC

       /DYNAMIC
       /NODYNAMIC

    Controls whether a display automatically adjusts its window
    dimensions proportionally when a SET TERMINAL command is issued.
    /DYNAMIC is the default.

3    /HIDE

    Conceals the display under any other displays that overlap it.
    As a result, any displays that were previously hidden under the
    specified display become visible.

4    /POP

       /POP
       /NOPOP

    /POP places a specified display at the top of the display
    pasteboard, ahead of any other displays. This is the default.
    /NOPOP preserves the order of all displays on the pasteboard.

5    /PUSH

       /PUSH
       /NOPUSH

    /PUSH has the same effect as /HIDE. /NOPUSH preserves the order
    of all displays on the pasteboard (same effect as /NOPOP).

6    /REFRESH

    Refreshes the terminal screen. Do not use parameters or other
    qualifiers on a DISPLAY/REFRESH command.

7    /REMOVE

    Creates a display that does not appear on the screen. Its
    definition and textual contents are saved, and can be brought
    back with another DISPLAY command.

8    /SIZE

       /SIZE:n

    Changes the maximum size of a normal output display to n lines.
    If more than n lines are written to the display, the oldest lines
    are lost as the new lines are added. If you omit this qualifier,
    the maximum size is not changed.