The Caché Callout Gateway (implemented in the Caché $ZF functions) allows you to invoke external programs and system services from Caché. It also provides a way to integrate your custom code into Caché.
This book addresses the following topics:
Introduction introduces concepts important to understanding the rest of this book, summarizes the capabilities of the Caché Callout Gateway, and provides links to samples and other resources.
Creating a Caché Callout Library describes how to create a Callout shared library with functions that can be invoked from Caché. Code can be written in any language that supports C/C++ calling conventions.