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A CICS transaction is a collection of logically related programs in an application.The whole application could be logically divided into several transactions.The core of CICS known as the CICS Nucleus which consists of IBM-supplied CICS Control Programs and Control Tables.CICS nucleus is constructed by the control programs and corresponding control tables. It makes the CICS system highly flexible and thus easy to maintain.Today, 3270 emulation software is available which means that even normal PCs can be used as 3270 terminals.3270 terminals are dumb terminals and do not do any processing themselves.We must have knowledge of the basic terms used in CICS to get a better understanding of how it works.
It has the following characteristics − A CICS program is invoked through a transaction.The difference between a transaction and a task is that several users can invoke a transaction but each user initiates his own task. LUW states that a piece of work should be done completely or not done at all.A task can contain several Logical Unit of Works in CICS. An application is a series of logically grouped programs to form several transactions which is used to complete a specific task for the end-user.a The five CICS system components described earlier are a convenient grouping of CICS system programs, each of which performs its own specialized functions.CICS allows users to communicate with the back-end system to get the desired information.Examples of online programs include online banking system, flight reservation, etc.