---
title: "Messages | Microsoft Docs"
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# Messages
The message loop in the **Run** member function of class `CWinApp` retrieves queued messages generated by various events. For example, when the user clicks the mouse, Windows sends several mouse-related messages, such as `WM_LBUTTONDOWN` when the left mouse button is pressed and `WM_LBUTTONUP` when the left mouse button is released. The framework's implementation of the application message loop dispatches the message to the appropriate window.  
  
 The important categories of messages are described in [Message Categories](../mfc/message-categories.md).  
  
## See Also  
 [Messages and Commands in the Framework](../mfc/messages-and-commands-in-the-framework.md)