Using the Callout Gateway
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Preface : 
Chapter 1: 
1.1 Callout Gateway Concepts and Terminology
1.2 Overview of $ZF Functions
1.3 Compatible Languages and Compilers
Chapter 2: 
2.1 Introduction
2.2 Program Execution
2.3 Logging Commands and Redirecting Output
2.4 Adding the %System_Callout:USE Privilege
Chapter 3: 
3.1 Introduction to Callout Libraries
3.2 ZFEntry Linkage Options
3.3 Callout Library Runup and Rundown Functions
3.4 Troubleshooting
Chapter 4: 
4.1 Callout Library Interfaces
4.2 Using $ZF(-3) for Simple Library Function Calls
4.3 Using $ZF(-5) to Access Libraries by System ID
4.4 Using $ZF(-6) to Access Libraries by User Index
Chapter 5: 
5.1 Invoking Statically Linked Callout Functions
5.2 Creating a Custom CACHE.EXE File in Windows
5.3 Creating a Custom CACHE.EXE File in UNIX®, Linux, or OS-X
Chapter 6: 
6.1 Additional Call-Out Signal Processing
Chapter 7: 
7.1 Using Statically Linked Functions
7.2 $ZF(-100): Running Programs or System Commands
7.3 $ZF(-3) and $ZF(-5): Accessing Libraries by Name
7.4 $ZF(-6): Accessing Libraries by User Index

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