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The B-right/V R2 Operating System (2000)

Although it may not seem like it, what can broadly be termed "personal computing devices" are based on only three conceptual models. In order of their historical appearance, they are: the "stand alone computer model," which first came into being as the batch processing mainframe with a command line interpreter; the "networked stand alone computer model," which saw its first incarnation as the object-oriented workstation with a graphical user interface (GUI); and the "network interface computer model," a terminal-like computer for single users in an environment where all computers are linked together.

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