'''[https://en.wikipedia.org/wiki/Event-driven_programming%|%event
processing]''' is a [multitasking] technique in which a program learns of
events and responds to them.



** See Also **

   [event-oriented programming]:   

   [Tcl event loop]:   One of the components of Tcl's asynchronous event mechanism Tcl.



   [Event programming and why it is relevant to Tcl/Tk programming]:   

   [How to mimic event generation without TK]:   One approach to providing user-defined events without relying on window systems or I/O.  Probably a predecessor of [uevent].

   [uevent]:   A module in Tcllib that provides an event system somewhat similar to that of Tk.

   [windowing system events]:   



** Description **

In Tcl, channel events and `[after]` events are sent to the [notifier].  [Tk]
sends [windowing system events]  to the notifier.  The [Tcl C API] provides
means for any extension to create its own event types, and also to communicate
and process events.



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