The CUP can send a message to the MHP in send-only mode. This is called a send-only message.

To send a message to the MHP, the CUP issues the dc_clt_send_s function. To use the message assembly facility or message delivery confirmation facility, the CUP issues the dc_clt_assem_send_s function.

Before sending a send-only message, the following must be specified in the client environment definition.

• Specify the node name of the connection destination in DCSNDHOST.
• Specify the port number (port number specified in the portno operand of the mcftalccn definition command in the MCF communication configuration definition) of the connection destination in DCSNDPORT.

It is also necessary to issue the dc_rpc_open_s function with DCCLT_ONEWAY_SND specified in the flags.

The following figure shows the processing of a send-only message.

Figure 2-18 Processing of send-only messages