programming The top-level control flow construct in an input- or event-driven program, the one which receives and acts or dispatches on the program's input events. See also driver. [Jargon File] (2004-03-12)
As we walk along we are conscious of the number of unescorted women, walking the main loop thoroughfare.
Both the main loop, and the smaller one on the nose, illustrate the point made on p. 89.