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The word software is also sometimes used in a more narrow sense, meaning application software only. At the lowest level, executable code consists of machine language instructions specific to an individual processor âtypically a central processing unit (CPU).
In some types of embedded systems, the application software and the operating system software may be indistinguishable to the user, as in the case of software used to control a VCR, DVD player or microwave oven. The above definitions may exclude some applications that may exist on some computers in large organizations.