The Move Text from One Virtual Display to Another routine moves
    a rectangle of text from one virtual display to another virtual
    display. Given two points in opposite corners of the rectangle,
    SMG$MOVE_TEXT determines the desired width and height of the new
    virtual display.

    Format

      SMG$MOVE_TEXT  display-id ,top-left-row ,top-left-column

                     ,bottom-right-row ,bottom-right-column

                     ,display-id2 [,top-left-row2]

                     [,top-left-column2] [,flags]