Main Loop: N. 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.
:main loop: n. 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. See also {driver}.
-- The AI Hackers Dictionary
filter: [orig. {{UNIX}}, now also in {{MS-DOS}}] n. A program that
processes an input data stream into an output data stream in some
well-defined way, and does no I/O to anywhere else except possibly
on error conditio...