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

    This routine is similar to the pmap_getmaps routine. However,
    pmap_getmaps_vms also returns the process identifiers (PIDs) that
    are required for mapping requests to TCP/IP Services hosts.