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These include batch processing, time sharing, and real-time processing. Multiprogramming requires that the active parts of the programs competing for the processor be available in main memory. Multiprogramming is the capacity of a computer to executing several programs concurrently on the same processor by having one of the programs using the processor while others are performing input or output. Horizontal packages - can perform a certain general function, such as accounting, or office automation, for a range of businesses. Vertical packages - assist users within a specific industry segment. Examples include packages that help to manage construction projects, keep track of inventory of hospitals, or fast-food outlets. Ever since its introduction in 1984, users of the Apple Macintosh have been quite biased about their preference for the Macintosh operating system over Microsoft’s. When Microsoft introduced Windows, Apple sued Microsoft, claiming that they copied the “look and feel” ...