NTSTATUS NtRequestPort( IN HANDLE PortHandle, IN PPORT_MESSAGE RequestMessage ); Routine Description: A client and server process send datagram messages using this procedure. The message pointed to by the RequestMessage parameter is placed in the message queue of the port connected to the communication port specified by the PortHandle parameter. This service returns an error if PortHandle is invalid or if the MessageId field of the PortMessage structure is non-zero. Arguments: PortHandle - Specifies the handle of 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.