Appendix D. Below the SNA interface

The information provided in the main sections of this book enables a programmer to construct valid command sequences for distributed processes. However, to design high-performance distributed processes, you need some understanding of the SNA protocols and corresponding data flow control (DFC) indicators that CICS® uses for DTP. You also need to understand how the DFC indicators relate to the CICS commands and options. In addition, you need this knowledge to understand the CICS trace.

Except for some commands that can cause transmissions "against the flow" (such as ISSUE SIGNAL), the conversation flow and indicators set are dictated by the transaction currently in send state (state 2).

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