A brief commentary on the RAND interactive man-computer graphical system, designed to supplement the film, [The GRAIL Project]. The cathode-ray-tube screen is conceived as a common working surface for both man and computer (the man writes or draws onto it by writing or drawing on the associated RAND Tablet surface). The CRT display must be updated every 30 or 40 milliseconds to allow the user to keep his attention fixed effortlessly on the screen while interacting with his problem. The system depends heavily on real-time symbol recognition. Functions can be invoked by pressing "virtual buttons"--that is, by pressing the equivalent spot on the Tablet--and there is one hardware button to return the system to sign-in condition. The bulk of the paper consists of sample CRT display formats. 19 pp. Ref. Bibliog.
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