driver
     n 1: the operator of a motor vehicle [ant: {nondriver}]
     2: someone who drives animals that pull a vehicle
     3: a golfer who hits the golf ball with a driver
     4: (computer science) a program that determines how a computer
        will communicate with a peripheral device [syn: {device
        driver}]
     5: a golf club (a wood) with a near vertical face that is used
        for hitting long shots from the tee [syn: {number one wood}]
Source: WordNet® 2.0

driver n. 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.


Source: The Jargon File