IBM introduced the first CICS Internet connection option in CICS/ESA 3.3, with support for the CICS socket interface option of TCP/IP for MVS. Since then, with each new release—and often between releases via SupportPac offerings—IBM has continued to provide CICS with new Internet connectivity capabilities and features, generating so many support features that it’s difficult to keep up with them all.

This article won’t attempt to cover all the various interface options available to the CICS developer; there are simply too many. Instead, we’ll focus on…

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