In recent years personal computers started fast development. Their processing power rapidly increased and work environment became friendlier for the end user. Accordingly, management and maintenance of mass data raised a need for enhanced data security and protection computer system equipped with central MAINFRAME seems to be a good solution for this problem, because of its data protection and data gathering methods. With regard to workstations, PCs using emulators may perform their tasks, although dump terminals used to be traditional workstations. Nevertheless, it is LAN with PCs connected to MAINFRAME provides reasonable opportunities and cover needs of all the users, which are often spread in a wide area.
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