Notification messages notify a control's parent window of actions that occur within the control. Controls use the WM_COMMAND message to notify the parent window of actions that occur within the control. The wParam parameter of the WM_COMMAND message contains the control identifier; the low-order word of the lParam parameter contains the handle of the control; and the high-order word of lParam contains the control notification message.
This section lists notification messages in alphabetic order.