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In certain computer operating systems, a job step is part of a job, a unit of work that a computer operator (or a program called a job scheduler) gives to the operating system. For example, a job could be the running of an application program such as a weekly payroll program. A job is usually said to be run in batch (rather than interactive) mode. The operator or job scheduler gives the operating system a "batch" of jobs to do (payroll, cost analysis, employee file updating, and so forth) and these are performed in the background when time-sensitive interactive work is not being done. In IBM mainframe operating systems (MVS, OS/390, and successors) a job is described with job control language (JCL). Jobs are broken down into job steps. An example of a job step might be to make sure that a particular data set or database needed in the job is made accessible.