Nonstandard Messages
Until now, the discussion has centered on regular Windows messages (those that begin with WM_XXX). However, two other major categories of messages merit some discussion: notification messages and user-defined messages.
Notification Messages
Notification messages are messages sent to a parent window when something happens in one of its child controls that might require the parent's attention. Notification messages occur only with the standard Windows controls (button, list box, combo box, and edit control) and with the Windows Common Controls (tree view, list view, and so on). For example, clicking or double-clicking a control, selecting some text in a control, and moving the scrollbar in a control all generate notification ...
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