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

 xdrs
    A pointer to an XDR stream handle created by one of the XDR
    stream handle creation routines.
 rpp
    A pointer to a pointer to a pmaplist_vms structure containing
    a list of Portmapper programs and their respective information,
    including OpenVMS-specific information.