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The purpose of the BBN time-sharing system is to increase the effectiveness of the PDP-1 computer for those applications involving manmachine interaction by allowing each of the five users, each at his own typewriter to interact with the computer just as if he had a computer all to himself. The effectiveness of this interaction is further enhanced by the use of the TYC language for controlling the operation and modification of programs.
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McCarthy et al. (1963) studied this question.