job entry system

from The Free On-line Dictionary of Computing (8 July 2008)

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.

   (1996-03-23)