Editing Job Entry Subsystem 2/3 (section)

=== Alternatives ===
There was also a JES in [[OS/VS1]] that was often referred to as [[Job Entry Subsystem 1|JES1]].<ref name=ibm-systems-journal-13-3-253/><ref name=gc20-1752-0/> In addition, the ''master'' (''MSTR'') subsystem, which is built into MVS, can start jobs that run outside of the control of the primary  JES, including the ''Master Scheduler'' and the primary JES itself.<ref>{{cite manual
 | title       = OS/VS2 System Logic Library Volume 3 - VS2.03.804 - VS2.03.807 - VS2.03.810
 | id          = 5Y28-0763-0
 | date        = July 1976
 | edition     = First
 | section     = Master Subsystem
 | section-url = http://bitsavers.org/pdf/ibm/370/OS_VS2/PLM/SY28-0763-0_OS_VS2_System_Logic_Library_Vol_3_Rel_3.7_Jul76.pdf#page=343
 | pages       = 3-169-3-191
 | url         = http://bitsavers.org/pdf/ibm/370/OS_VS2/PLM/SY28-0763-0_OS_VS2_System_Logic_Library_Vol_3_Rel_3.7_Jul76.pdf
 | access-date = June 12, 2022
 | publisher   = [[IBM]]
 | series      = Systems
 }}
</ref> Originally the JCL for the Master subsystem was in an IBM provided load modules, but in current versions of MVS through z/OS, it can be provided as a member of the system parameter library (PARMLIB).