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An Introduction to IMS: Your Complete Guide to IBM Information Management System by Steve Nathan, Sandy Sherrill, Rick Long, Moira McFadden Lanyi, Margaret Wilson, Kenny Blackman, John Butterweck, Diane Goff, Barbara Klein

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Chapter 14. Application Programming Overview

This chapter provides an overview of IMS-managed application programs that run in IMS-dependent regions.

IMS defines an application programming model to be used for accessing IMS services based on the type of dependent region runtime environment. A program specification block (PSB) establishes the interface from the application program to IMS services and the IMS-managed resources the application program is authorized to access. A program communication block (PCB) is the connectivity to an IMS-managed resource. The PSB consists of one or more PCBs that are provided to the application program.

The IMS services can be used for the following:

• Sending or receiving messages using an I/O PCB

• Sending ...

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