/RPC=(PROGRAM_NUMBER=n, VERSION_NUMBER=(LOW=n, HIGH=n))

    Required for services that use the Portmapper; otherwise, not
    valid. Defaults:

                 Program      Highest
    Service      Number       Version      Lowest Version

    MOUNT        100005       1            1
    NFS server   100003       2            2
    PCNFS        150001       1            2
    PORTMAPPER   100000       1            1

    Information that identifies the service to the Portmapper. Use
    this qualifier for all applications that use RPCs.