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ITS

   influential but highly idiosyncratic operating system written for
   PDP-6s and PDP-10s at MIT and long used at the MIT AI Lab.  Much
   AI-hacker jargon derives from ITS folklore, and to have been `an
   ITS hacker' qualifies one instantly as an old-timer of the most
   venerable sort.  ITS pioneered many important innovations,
   including transparent file sharing between machines and
   terminal-independent I/O.  After about 1982, most actual work was
   shifted to newer machines, with the remaining ITS boxes run
   essentially as a hobby and service to the hacker community.  The
   shutdown of the lab's last ITS machine in May 1990 marked the end
   of an era and sent old-time hackers into mourning nationwide (see
   high moby).  The Royal Institute of Technology in Sweden is
   maintaining one `live' ITS site at its computer museum (right next
   to the only TOPS-10 system still on the Internet), so ITS is still
   alleged to hold the record for OS in longest continuous use
   (however, WAITS is a credible rival for this palm).  See
   Appendix A.  2. A mythical image of operating-system perfection
   worshiped by a bizarre, fervent retro-cult of old-time hackers and
   ex-users (see troglodyte, sense 2).  ITS worshipers manage
   somehow to continue believing that an OS maintained by
   assembly-language hand-hacking that supported only monocase
   6-character filenames in one directory per account remains superior
   to today's state of commercial art (their venom against UNIX is
   particularly intense).  See also holy wars,
   Weenix.