The installation of TP1/Message Control in a system furnished with the basic OpenTP1 facilities (TP1/Server Base) enables message exchange mode communication with mainframes and workstations through wide area networks (WANs), TCP/IP, and conventional networks.

MHPs are used for communication based on messages. SPPs can also be used for some message processing.

Before the message exchange facility can be available, TP1/Message Control must be installed in the system and the basic OpenTP1 facilities must be provided by TP1/Server Base. TP1/Messaging is required when you create MHPs under TP1/LiNK.

The figure below shows message exchange mode communication.

Figure 3-5 Outline of message exchange mode communication

User exit routines can be created so that UAP message processing will cover a wide variety of purposes. They can be written to meet particular requirements for jobs and environments. For details on user exit routines, see 3.9 User exit routines.

Organization of this section

3.6.1 Message communication modes

3.6.2 Message structure

3.6.3 Receiving messages

3.6.4 Sending messages

3.6.5 Synchronous message processing

3.6.6 Continuous-inquiry-response processing

3.6.7 Resending messages