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CTOS, or Convergent Technologies' Operating System, x86. It was a message-based client-server OS that was popular because it allowed diskless workstations hooked to a server. Shared disk, network, printers etc. Much more capable that DOS. Ran in a 1MB machine (they used to have those!) No special network cards - networking was built in. And no system administrator needed. Popular with govt buyers who calculated total cost of ownership for the whole system.

Convergent manufactured their own line of desktop computers. Initially marketed as 'scientific', they quickly found that enterprise was where the money was. So we built a whole office suite, Document Designer, editors, print engine, a Multiplan port (pre-Excel) from a goofy guy at a company called Microsoft.

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