NTSTATUS
LpcRequestPort(
  IN  PVOID PortAddress,
  IN  PPORT_MESSAGE RequestMessage
  );

Routine Description:

    This procedure is similar to NtRequestPort but without the Handle based
    interface.

Arguments:

    PortAddress - Supplies a pointer to the communication port to send
        the request message to.

    RequestMessage - Specifies a pointer to the request message.  The Type
        field of the message is set to LPC_DATAGRAM by the service.

Return Value:

    NTSTATUS - A status code that indicates whether or not the operation was
        successful.