z/OS MVS JCL Reference
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z/OS MVS JCL Reference

If you do not specify the CLASS keyword, JES uses the installation default specified at initialization, as follows:
  • In a JES2 system, the default is based on the source of the job: The system makes the job’s class the same as the installation-specified default class for the particular card reader, work station, or time-sharing user that submitted the job.
  • In a JES3 system, the default is an installation-defined standard default class.

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