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The primary purpose of this paper is to explore the parameters of display devices that might better serve the needs of highly interactive man-machine systems. Examples of what is meant by "highly interactive" are those systems designed to aid editors in the acquisition, correction, and production editing of "camera-ready" textual information, assist with the development of design drawings in computer-aided engineering design, and provide for development and management information systems graphic reports that can be interacted with by the user. CRTs are the most versatile and ubiquitous form of display in the machine-to-man communication part of this interface. Two major technical drawbacks to CRTs for this function are the size of the work space and the resolution. To significantly increase either of these greatly increases the costs that are already too high for many applications. For the man-to-machine portion of the interface, the CRT has some undesirable characteristics.