Library /sys$common/syshlp/LSE$CLIHELP.HLB  —  SET  SCROLL_MARGINS, Parameters
 top-line-count
    Specifies the number of lines down from the top of a window at
    which you want downward scrolling to begin.

 bottom-line-count
    Specifies the number of lines up from the bottom of a window at
    which you want upward scrolling to begin.

 %
    Optionally specifies scroll margins as percentages of the window
    height, rounded to the nearest whole line count. This is useful
    when you have a workstation with screens of varying sizes.
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