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

       /DOWN[=value]

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

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