Customer Information Control System
Customer Information Control System (CICS) is the most widely used transaction program today. It is highly scalable and can support thousands of simultaneous transactions. CICS is not an individual application; it is more an application subsystem, to use IBM terminology. CICS has characteristics that enable programmers to use a common set of application programming interfaces (API). A programmer can write a transaction program, and CICS handles the multiplexing of all transactions.