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Reference.org
Convergent Technologies Operating System
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<p>The Convergent Technologies Operating System, also known variously as CTOS, BTOS and STARSYS, is a discontinued modular, <a href="/facts/Message-passing/RYf3hD3J">message-passing</a>, multiprocess-based <a href="/facts/Operating_system/8XTuvMh2">operating system</a>. </p>