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Q: What is PRTY parameter?

Answer:
PRTY sets selection priority. PRTY=15 on JOB card. Values 0-15 (15 highest). Affects when job selected from queue. JES2 processes higher PRTY first within class. Different from PERFORM (execution priority).
JCL
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Q: What is INTRDR?

Answer:
SYSOUT=(class,INTRDR) submits output as new job. Internal reader. Programs can submit jobs dynamically. Class often B. Output must be valid JCL. Used for job scheduling, dynamic workflows.