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The '''Convergent Technologies Operating System''', also known variously as '''CTOS''', '''BTOS''' and '''STARSYS''', was a modular, [[message-passing]], multi-process based [[operating system]].
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[[Progress Software Corporation]] made a commercial database application for CTOS that was in [[4GL]]. The US Coast Guard used these databases for logistics administration for their vessels.
There was a transparent peer-to-peer network running over serial [[EIA-422|RS-422]] cables, and later over twisted pair with RS-422 adapters. Each workgroup, called a "cluster," was connected via a daisy-chain topology to a server, called a "master." The workstations, normally [[diskless workstation|diskless]], were [[networking booting|booted over the cluster network]] from the master, and could optionally be locally booted from attached hard drives.
You could custom-link the operating system to add or delete features.
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