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

       /UP[=value]

    Scrolls the LATCP screen display up the number of lines indicated
    by the specified value. For convenience, you can also use the
    Prev (or Prev Screen) key on your keyboard to scroll up 15 lines
    (instead of entering the SCROLL/UP=15 command).

    If you do not specify a value, the default value is 1.