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runtime engineSoftware that must be running in the computer for applications to execute. For example, all programming language interpreters are runtime engines. They convert the program, which is in its original source code or which has been converted into an interim, intermediate language, into machine language. In addition, runtime engines provide common routines and functions that the applications require.
Although not classified as such, one might call an operating system a runtime engine because it is always required. Indeed, it "is" the essential runtime engine; however, the OS falls into the "runtime environment" category.
Runtime Engine Examples
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