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In page Batch processing:
"The IBM mainframe z/OS operating system or platform has a set of batch processing facilities.[citation needed] Such systems commonly support hundreds or even thousands of concurrent online and batch tasks within a single operating system image. Technologies that aid concurrent batch and online processing include Job Control Language (JCL), scripting languages such as REXX, Job Entry Subsystem (JES2 and JES3), Workload Manager (WLM), Automatic Restart Manager (ARM), Resource Recovery Services (RRS), IBM Db2 data sharing, Parallel Sysplex, performance optimizations such as HiperDispatch, I/O channel architecture, and others.
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