Architecture: CICS

A bank teller presses Enter. Within 30 milliseconds, the customer's account balance is on the screen. Somewhere in a data center, a COBOL program ran, read a VSAM file, formatted a response, and terminated. The same thing happened simultaneously for several thousand other tellers at other terminals in other branches. None of them waited for each other. None of them interfered with each other's data. That is CICS. It has been doing exactly… Read More