VMS Help MACRO, /MIGRATION, Macros for 64-Bit Addressing, $SETUP CALL64, Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 arg_count

    The number of arguments in the call.

 inline

    Forces inline expansion, rather than creation of a JSB routine,
    when set to TRUE. If there are six or fewer arguments, the
    default is INLINE=FALSE.