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

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JES3 dynamic support programs
JES3 is composed of routines called dynamic support programs, (DSPs). With the same mechanisms it uses for processing jobs, JES3 schedules and processes DSPs. JES3 users can write their own dynamic support programs to customize JES3 processing in their system.
Most of the JES3 programs in the global processor is divided into parts called dynamic support programs, or DSPs. There are DSPs for reading job input, for processing jobs, and for writing job output. What distinguishes DSPs from ordinary routines or subroutines ...

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