Input/output, or I/O, is, in the general sense, the set of mechanisms by which a program is made ‘aware’ of its environment. I/O is usually envisaged as flow of data, of some form or another, into and out of a piece of software. In a supported environment, I/O is one of the most immediately apparent facilities provided by the operating system to user programs. A program may, in fact, make use of an intermediate facility, a run-time system, for example, to access the system I/O procedures.
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