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IBM Operating System for System 390 and other mainframes in the System/360 family.

TPF evolved from the Airlines Control Program[?] (ACP), a free package developed in the mid-1960s by IBM in association with major North American and European Airlines. In 1979, TPF was introduced by IBM to substitute ACP, as a priced software product.

TPF is designed for fast, high-volume, high-throughput transaction processing, handling large continuous loads of essentially simple transactions across large, geographically dispersed, networks. The world's largest TPF-based systems, running on multiple IBM mainframes, are capable of processing tens of thousands of transactions per second.

TPF is also designed for highly reliable continuous (24 x 7 x 365) operation.

TPF implements an API known as the PARS API, on which many Airline and Financial systems are based.

(More details?). See also ALCS[?].

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