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

    The APPEND Analyzer command allows you to concatenate many
    separate histograms, tables or listings into a single file. You
    can specify a file, or accept the most recently created file as
    the default; however, the file must exist.