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ABCs of z/OS System Programming Volume 13 by Juha Vainikainen, Paul Rogers

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JES3 input service
Input service is the JES3 function that accepts and queues all jobs, entering the JES3 system, except those invoked via the *X command. When jobs are sent to a JES3 global, JES3 input service does the following:
Processes JCL control statements
Creates scheduler elements that represent work to be executed by JES3
Adds jobs to the JES3 job queue.
The global processor reads the job into the system from one of the following input sources:
A local card reader
A local tape reader
A disk reader
A remote work station ...

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