VMS Help CC, Messages, DUPPARM  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> "<name>" is a duplicate parameter name.

 Description    The parameter identifier list of an old-style
                function definition uses the same identifier more
                than once.

 User Action    Each identifier in the parameter list must be unique.
                Compaq also recommends that old-style function
                definitions be replaced by prototype-format
                definitions.