The SCROLL command allows you to quickly scan through a large window
  without changing the current selection of information. The window must
  either be selected or be the only window in the display. The window can be
  scrolled vertically or horizontally by a specific number of lines or fields.
  When the window scrolls, the header remains stationary. The left, right, and
  bottom border lines, as well as lines that separate fields where the lines
  join the header portion of the window, indicate in which direction the window
  has been scrolled. Pertinent information may not be currently visible.

  Formats:  SCROLL UP value             SCROLL LEFT value
            SCROLL DOWN value           SCROLL RIGHT value

  If AUTO_POSITIONING is turned ON, other windows on the screen can be
  repositioned as the selected window is scrolled. The arrow keys can be
  redefined as SCROLL commands. For more information see help on SET FUNCTION.