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  • OS/390

    OS/390 is the IBM operating system most commonly installed on its S/390 line of mainframe server. Continue Reading

  • Job Entry Subsystem (JES)

    Job Entry Subsystem (JES) is a subsystem of the OS/390 and MVS mainframe operating systems that manages 'jobs' (units of work) that the system does. Each job is described to the operating job control language (JCL). Continue Reading

  • archive

    An archive is a collection of computer files that have been packaged together for backup, to transport to some other location, for saving away from the computer so that more hard disk storage can be made available, or for some other purpose. Continue Reading

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