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Graphical information exchange using direct-view display consoles is a rapidly growing means of communicating between a human and a computer. One reason for this growth is that results presented to a human in graphical form are concise and readily understandable. Another reason is that through alternate viewing of graphical output displays and entering of new inputs, either graphically or by other means, based on these output displays, a user can monitor and guide a computer during the course of a complex problem solution. Such interaction generally produces more rapid and often better problem solutions. In many cases, interaction allows a problem to be solved which would not even be attempted using other techniques.