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how does the user know to use Execution Indirection and what to set the parameters to?
The person responsible for building the projects needs to know the application, and know whether it has any utility functions like LINK. A lot of shops will have utility programs that dynamically allocate data sets based on the name, and associate them with a COBOL FD, for example (using SVC 99). That's the kind of thing Execution Indirection is designed to handle.