driver

1. The {main loop} of an event-processing program; the code that gets commands and dispatches them for execution.
2. [techspeak] In device driver, code designed to handle a particular peripheral device such as a magnetic disk or tape unit.
3. In the TeX world and the computerized typesetting world in general, a program that translates some device-independent or other common format to something a real device can actually understand.

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