VMS Help TCPIP Services, Programming Interfaces, RPC Portmapper Routines, pmap_getport  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Returns the port number on which the specified service is
    waiting.
    Format
      #include  <rpc/pmap_clnt.h>
      u_short  pmap_getport(struct sockaddr_in *addr, u_long prognum,
               u_long versnum, u_long protocol );

  Additional Information (explode) :

• Arguments
• Description
• Return Values