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DOS, short for Disk Operating System is an operating system developed by Microsoft. It is often regarded by the experienced computer users among the Tau'ri as a inadequate operating system with very few uses. Whilst aboard a Wraith Hive ship, Dr. Rodney McKay accessed the Wraith computers and claimed that the operating system is a "mess", then saying "Thank goodness I remember DOS". (SGA: "No Man's Land")