This is the third of four topics detailing the CICS® APIs available for DTP programming.
The different APIs are compared in Concepts and design considerations.
Part 4 contains:
This describes how to write APPC basic conversations using the EXEC CICS GDS interface. To use this interface, the application must insert the data to be sent into GDS (generalized data stream) records and extract it from records received. This topic describes the format of GDS records and a possible strategy for building them.
Note that CICS applications that use the APPC basic interface can be written only in assembler language or C.
This discusses the state transitions that occur when transactions use APPC basic conversations under the EXEC CICS GDS API. The state transitions are presented in the form of state tables showing which commands can be issued while a conversation partner is in any given state. The tables also show how the conversation state changes as a result of issuing a command.
For further information about the APPC architecture, see Peer Protocols, SC30-3269 and LU6.2 Reference: Verb Descriptions, GC30-3084. For information about the mapping between APPC verbs and CICS commands, see Appendix A. CICS mapping to the APPC architecture.
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