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An introduction to the five most popular mini and mainframe operating systems, defining and explaining only the most important concepts and commands necessary to log on and use each system, and also providing a realistic look at the strengths and weaknesses of each system. Included are 'sidebars' throughout that highlight current buzzwords, as well as stepbystep examples, historical background, and some 150 screen images. Annotation copyright Book News, Inc. Portland, Or.
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