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TPNS (Teleprocessing Network Simulator) is an IBM product used to simulate large numbers of network terminals to a host system, both for stress testing and functional testing. Primarily an SNA terminal simulator, it is also capable of simulating non-SNA terminals types such as X.25.

TPNS can also be used to simulate TCP/IP servers and clients. Another very useful feature of TPNS is that it can be used for prototyping software during the development process. The web site below illustrates the use of Structured Translator Language (or 'STL', a TPNS high-level scripting language, with a syntax very similar to REXX) to prototype elements of an ATM shared network.

IBM Workload Simulator for z/OS is another, similar tool more recently introduced to the market.

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