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JES3 to JES2 Migration Considerations by Tom Wasik, John Unterholzner, John A. O'Leary, Brad Habbershaw, Bruce Dennis, Karan Singh, Frank Kyne

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JECL and JCL differences
JES2 and JES3 have evolved over time by introducing new functions that address the needs of their specific customer sets. As a result, there are job entry control language (JECL) and job control language (JCL) statements that are unique to JES2 or JES3. There are also some JCL statements that are common to both, but that are processed slightly differently by the two JESs. This chapter lists those differences and recommends ways to migrate JES3-specific JCL streams to equivalents that will work with JES2.
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