1 Chapter 1. CICS Transaction Gateway The CICS Transaction Gateway (CICS TG) is a market-leading connector that provides a high performing, secure, scalable, and tightly integrated method of e-business access to CICS. It enables CICS customers to expand the value of their investment in classic CICS applications and usually requires no changes to existing CICS applications. It is easy to install and has flexible configuration options that require minimal changes to CICS. It provides a range of networking options and provides a choice of JavaTM and non-Java client programming interfaces. In this chapter, we introduce the CICS TG components, the application programming interfaces (APIs) that it provides. We also discuss the J2EE Connector Architecture (JCA), the CICS JCA resource adapters, and the topologies in which you can deploy the CICS TG. © Copyright IBM Corp. 2006. All rights reserved. 3