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This type of call is intended for use by programs. It enables the program to pass requests, accept replies, respond on the basis of the reply, and maintain communication between the program and the API.
The basic communication area, which is passed back and forth between the calling program and the API, is mapped by the Assembler DSECT CTMBAPI, which can be found in the IOA MAC library. Different fields in this DSECT identify the request, specify the selection criteria, and pass the address of the area in which replies to the caller are to be returned.
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