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As time sharing systems developed, interactive job control emerged. An end-user in a time sharing system could submit a job interactively from his remote [[computer terminal|terminal]] ([[remote job entry]]), communicate with the operators to warn them of special requirements, and query the system as to its progress. He could assign a priority to the job, and terminate (kill) it if desired. He could also, naturally, run a job in the foreground, where he would be able to communicate directly with the executing program. During interactive execution he could interrupt the job and let it continue in the background or kill it. This development of [[interactive computing]] in a multitasking environment led to the development of the modern [[shell (computing)|shell]].
===JCL, file systems and device independence===
The ability to not have to specify part or all of the information about a file or device to be used by a given program is called
device independence.
==Real-time computing==
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