/sys$common/syshlp/helplib.hlb SET, ENTRY, Qualifiers, /PARAMETERS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /PARAMETERS=(parameter[,...])

    Specifies from one to eight optional parameters to be passed to
    the job. Each parameter can have as many as 255 characters. If
    you specify only one parameter, you can omit the parentheses.
    To specify a parameter that contains any special characters or
    delimiters, enclose the parameter in quotation marks.

    For batch jobs, the parameters define values to be equated to the
    symbols named P1 to P8 in each command procedure in the job. The
    symbols are local to the specified command procedures.