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

    If you want information about a particular qualifier or
    parameter, specify it as a subtopic. If you want information
    about all command qualifiers, specify "Qualifier" as a subtopic.
    If you want information about all parameters, specify "Parameter"
    as a subtopic. If you want all available information about a
    command, specify an asterisk (*) as a subtopic. If you want to
    redisplay the last help entry you viewed, enter a question mark
    (?).