/rē(-ə)l ä-pə-rā-tiŋ si-stəm/
n. The sort the speaker is used to. People from the academic community are likely to issue comments like
"System V? Why don't you use a *real* operating system?", people from the commercial/industrial UNIX sector are known to complain "BSD? Why don't you use a *real* Operating System?", and people from IBM object "UNIX? Why don't you use a *real* operating system?"
See holy wars, religious issues, proprietary, Get a real computer!