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IMS as a Transaction Manager

IBM developed an online component to ICS/DL/I to support data communication access to the databases. The DL/I callable interface was expanded to the online component of the product to enable data communication transparency to the application programs. A message queue function was developed to maintain the integrity of data communication messages and to provide for scheduling of the application programs.

The online component to ICS/DL/I became the Data Communications (DC) function of IMS, which is known today as the IMS Transaction Manager (IMS TM).

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