It is a variant of TPF specially designed to provide all the benefits of TPF (very high speed, high volume, and high availability in transaction processing) but with the advantages such as easier integration into the data center offered by running on a standard IBM operating system platform.
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However, the API it provides to applications is very similar to that on TPF, so applications written for TPF can run on ALCS with minimal modifications: typically fewer modifications than are required to move from one release of TPF to another.
Programmed Airline Reservations System (PARS) is an IBM proprietary large scale airline reservation application, a computer reservations system, executing under the control of IBM Airline Control Program (ACP) (and later its successor, Transaction Processing Facility (TPF)).
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The high performance PARS operating system evolved from ACP (Airlines Control Program) to TPF (Transaction Processing Facility).
In order to serialize accesses between data records on a loosely coupled system, a practice known as Record locking must be used.
In 2012, Worldspan customers were migrated from the TPF-based FareSource pricing engine to Travelport's Linux-based 360 Fares pricing engine already used by Galileo and Apollo.
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