Job Entry System


Also found in: Acronyms.

job entry system

[′jäb ¦en·trē ‚sis·təm]
(computer science)
A part of the operating system of a large computer system that accepts and schedules jobs for execution and controls the printing of output.

Job Entry System

(operating system)
(JES) An IBM mainframe term. There are really two JESs. JES2 is smaller and simpler, and can handle 99.99% of most jobs that run on IBM's MVS operating system. JES3 is much bigger and requires really big iron to run.