VMS Help JOB, Qualifiers, /PARAMETERS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

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

    Specifies 1 to 8 optional parameters that can be passed to the
    command procedure. The parameters define values to be equated to
    the symbols P1 to P8 in the batch job. The symbols are local to
    the specified command procedure.

    If you specify only one parameter, you can omit the parentheses.

    The commas (,)  delimit individual parameters. If the parameter
    contains any spaces, special characters or delimiters, or
    lowercase characters, enclose it in quotation marks (" ").
    Individual parameters cannot exceed 255 characters.