Nonclient-Area Mouse Messages
The 10 mouse messages discussed so far occur when the mouse is moved or clicked within the client area of a window. If the mouse is outside a window’s client area but within the window, Windows sends the window procedure a “nonclient-area” mouse message. The nonclient area of a window includes the title bar, the menu, and the window scroll bars.
You do not usually need to process nonclient-area mouse messages. Instead, you simply pass them on to DefWindowProc so that Windows can perform system functions. In this respect, the nonclient-area mouse messages are similar to the system keyboard messages WM_SYSKEYDOWN, WM_SYSKEYUP, and WM_SYSCHAR.
The nonclient-area mouse messages parallel almost exactly the client-area mouse ...
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