Third Edition (April 1978)
This edition, as amended by technical newsletters GN25-0167 and GN25-0171, applies
to GC28-0607-2. This edition applies to JES3 Release 3 (Selectable Unit ID5752-826)
of Job Entry Subsystem 3 and to all subsequent releases and modifications until
otherwise indicated in new editions or technical newsletters.
JES Release 3 runs under 0S/VS2 MVS. JES3 Release 3 must be applied to an 0S/VS2 MVS
Release 3.7 which has 0S/VS2 Scheduler/IOS Support (Selectable Unit ID 5752-816) and
0S/VS2 MVS Dumping Improvements (Selectable Unit ID 5752-833), or any subsequent
functionally equivalent release of MVS. For details concerning prerequisites and corequisites,
see 0SfVS2 MVS JESS Release 3 System Information, GC23-0024.

This publication contains introductory information about JESS, one of the primary job entry subsystems
of 0S/VS2. JESS is a separately orderable component of 0S/VS2. The reader should have a basic knowled'
of programming systems, such as OS/MVT or 0S/VS2.
Althoug'i this publication is deseed to be read from cover to cover, the di£'ters are generally independent
and can be referred to in any order. The chapters contain the following information:
• Chapter 1, "Introduction," presents highlights of JESS.
• Chapter 2, "JESS Concepts", presents JESS as a sub'stem and explains how a job flows throu' the
JESS complex.
• Chapter S, "JESS Services", discusses the services provided by JESS and how these services are used.
• Chapter 4, "Installation Interfaces with JESS Services", discusses how the user utilizes JESS services.
• Chapter 5, "MVS Job Processing Services used by JESS", discusses MVS services that JESS utilizes in
processing jobs through the JESS complex.
• Chapter 6, "Recovery Procedures and Service Aids", discusses the recovery procedures and service aids
provided with JESS.
• Chapter 7, "Planning Considerations", presents some preliminary information about plaiming and
generating a JESS system.
• Chapter 8, "JESS System Configuration Options", lists basic JESS hardware requirements and supported
I/O devices.

• "Glossary and list of Abbreviations" defines JESS and VS2 terms used in this manual.

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