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High Quality Content by WIKIPEDIA articles! IBM's MVS and z/OS operating systems use a job entry subsystem (JES) to receive jobs into the operating system, schedule them for processing by MVS or z/OS, and to control their output processing. There are two versions of the job entry subsystem concept, JES2 and JES3. The two systems have very little in common, and in fact jobs written to run on one usually require small Job Control Language changes before they can be run on the other.

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High Quality Content by WIKIPEDIA articles! IBM's MVS and z/OS operating systems use a job entry subsystem (JES) to receive jobs into the operating system, schedule them for processing by MVS or z/OS, and to control their output processing. There are two versions of the job entry subsystem concept, JES2 and JES3. The two systems have very little in common, and in fact jobs written to run on one usually require small Job Control Language changes before they can be run on the other.