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

       /DOWN[:n]

    Moves the bottom border of the display down by n lines (if n is
    positive) or up by n lines (if n is negative). If n is omitted,
    the border is moved down by one line.