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

 command-name

    The name of a LATCP command or LATCP command and command keyword.
    If you enter the HELP command with a command name only, such as
    HELP SET, LATCP displays a list of all of the command keywords
    used with the SET command.