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Virtual Telecommunications Access Method
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<p>Virtual Telecommunications Access Method (VTAM) is the <a href="/facts/IBM/QszA7nwd">IBM</a> subsystem that implements <a href="/facts/Systems_Network_Architecture/NlFaXaBC">Systems Network Architecture</a> (SNA) for <a href="/facts/Mainframe_computer/nrBR6rWa">mainframe</a> environments. VTAM provides an <a href="/facts/Application_programming_interface/GMlN4vUr">application programming interface</a> (API) for communication applications, and controls communication equipment such as adapters and controllers. In modern terminology, VTAM provides a communication stack and device drivers. </p>