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IBM’s Customer Information Control System (CICS) is an on-line teleprocessing system developed by IBM. By providing a sophisticated control and service database/data communication system, the application developer can concentrate on fulfilling specific business needs rather than on communication and internal system details. CICS allows data to be transmitted from the terminal to the host computer, have the data processed, access files/databases, and then has data to be transmitted from the terminal to the host computer, have the data processed, access files/databases, and then have data transmitted back to the terminal. To accomplish that, CICS uses a telecommunication package such as VTAM or TCAM and various file access methods: VSAM, DL/1, DB2, etc.

Functionality

• Data Communications: An interface between the terminal and printers with CICS
  via a telecommunication access method (TCAM or VTAM).
• Multi Region Operation(MRO), through which more than one CICS
  region of a system can communicate Intersystem Communication (ISC), through which one CICS region of a system can communicate with other CICS regions in other systems
• Application Programming:Interfaces with programming languages such as COBOL and Assembler
  Command level translator
• An Execution Diagnostic Facility (EDF)
• A Command Interpreter
• Data Handling: An interface with database access methods such as DB2, DL/1, and VSAM
  An interface with error checking and reporting facilities

Terminology

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