Job entry subsystem (JES3)
IBM's 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, JES3 and JES2. Some principle differences between the two JES systems include:
•JES3 provides resource management, dependent job control, and deadline scheduling for users of the system, while JES2 in the same system would require its users to manage these activities through ...