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Conversational Monitor System
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<p>The Conversational Monitor System (CMS, originally Cambridge Monitor System) is a simple <a href="/facts/Interactive_computing/gtzhk4sJ">interactive</a> single-user <a href="/facts/Operating_system/8XTuvMh2">operating system</a>. CMS was originally developed as part of IBM's <a href="/facts/CP%2fCMS/zzHA1Rzz">CP/CMS</a> operating system, which went into production use in 1967. CMS is part of IBM's <a href="/facts/VM_(operating_system)/Ymu9SRtX">VM family</a>, which runs on <a href="/facts/IBM_mainframe/0kPkgADx">IBM mainframe</a> computers. VM was first announced in 1972, and is still in use today as <a href="/facts/Z%2fVM/uhFIowB3">z/VM</a>. </p><p>CMS runs as a "guest" operating system in a private <a href="/facts/Virtual_machine/BLevU3sx">virtual machine</a> created by the <a href="/facts/VM_(operating_system)/Ymu9SRtX">VM</a> <i>control program</i>. The control program plus CMS together create a multi-user time-sharing operating system. </p>