Ever since command-level programming was introduced in CICS in 1975, an in-memory process called the communications area (COMMAREA) has been used to pass data from one application to another. From its inception, the size of the COMMAREA was held in a half-word data field— the EIBCALEN—which limited the size of the COMMAREA to 32KB. Although this was a problem, since most application  data was 3270-based and not, therefore, particularly resource hungry, the 32KB limit was sufficient to manage data propagation between applications. However, with the advent of Web-based applications, today’s CICS applications are required…

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