Library /sys$common/syshlp/teco.hlb TECO, Qualifiers, /SCROLL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Automatically enter split screen scrolling mode.  The bottom 1/4 of
  the screen's lines are scrolled.  The following qualifier keywords
  can be used to initially set scrolling modes:

    /SCROLL:n
     Set the number of lines to scroll to n.
    /SCROLL:SEEALL
     Set scrolling into SEEALL mode.
    /SCROLL:n:SEEALL
     Set the number of lines to scroll to n and SEEALL mode.