User:Shankar bhagat

CICS(Customer Interaction Control System) -> It can be thought of an operating system within another operating system. -> CICS is a specialized type of OS that provides an interface for execution of online application programs including iterfaces to files and database products. -> Mainly useful when online programs are to be executed on Batch OS like MVS(Multiple virtual storage). Eg. A cobol program running in online mode is running under the supervision of CICS on MVS OS.