Back when I worked with such things, THEOS was one of those ancient-ish obscure OSes. It was used to run a multi-user veterinary clinic management package. I a

Back when I worked with such things, THEOS was one of those ancient-ish obscure OSes. It was used to run a multi-user veterinary clinic management package. I actually quite liked it - it had a feature mix reminiscent of VMS, DOS and UNIX. I wonder what's still out there running it!? * https://en.wikipedia.org/wiki/THEOS https://en.wikipedia.org/wiki/THEOS * http://theos-software.com/ http://theos-software.com/