CICS@Mainframe Programming
CICS (Customer Information Control System) is an online transaction processing (OLTP) program from IBM that, together with the COBOL programming language, has formed over the past several decades the most common set of tools for building customer transaction applications in the world of large enterprise mainframe computing.
CICS
  Migrating to CICS Transaction Server
Are you aware that CICS/ESA V4.1 is no longer supported by IBM after this December?

Introduction to CICS
A Re-entrant program is one which does not modify itself so that it can reenter into itself and continue processing after an interruption by the operating system.


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