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

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JES3 output processing
JES3 output service performs three distinct functions:
Queueing output
Normally, output data produced by a job is placed in one of four output service queues when the job terminates. Spin-off data sets are placed in an output queue while the job is still in execution. The three output queues are:
 – Output service writer queue (Q=WTR): This queue contains data sets waiting for output processing by JES3 managed devices. Output service automatically selects data sets for processing based on their selection characteristics ...

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