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CICS (Customer Information Control System) is a programming language and transaction server that runs on mainframes. It helps with the development and management of online applications for transaction processing, by providing services like screen handling, task management, and data handling. CICS lets developers write their programs in COBOL or other supported languages then integrates them into a larger business application framework. The language interacts closely with IBM Db2 databases on z/OS systems to perform functions like retrieving or updating records in real-time environments.

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