Case Study
Airlines have traditionally been the poster children for external system connections. Many of the larger airlines use a fairly old operating system called TPF (Transaction Processing Facility) for their reservations systems. Although TPF is fast, it hasn't been very friendly to other operating systems until fairly recently. Airlines have had to resort to custom solutions when connecting to their existing TPF systems.
One airline developed a screen-scraping application that used a combination of TCP sockets, X.25, and a custom network to communicate with TPF. Over its lifetime, the application suffered occasional outages when the mainframe developers changed the format of the various screens. The advantage, however, is that the application ...
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