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

    Called when the desired program is not registered with the ONC
    RPC package. Generally, the Portmapper informs the client when a
    server is not registered. Therefore, service implementors usually
    do not use this routine.