The Event handler reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Event handler

An event handler is created by a programmer to tell the program how to act in respone to a specific event (e.g. the clicking of a mouse or the dragging of a scrollbar or pressing a button). Without event handlers nothing would happen when you interacted with an event driven program.

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