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ABCs of IBM z/OS System Programming Volume 2 by Lutz Kuehner, Guillermo Cosimo

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Subsystems and subsystem interface
This chapter provides a first approach to the subsystems, the subsystem interface (SSI), and the relation between them. This introduction guides you through the process of understanding the terms and components. You can choose to write your own subsystem or use IBM-provided (as well as third-party vendors) subsystems.
This chapter includes the following main topics:
2.1 Subsystem and SSI concepts
This section provides and overview of subsystems ...

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