>>668 ttp://msdn.microsoft.com/library/en-us/winui/winui/windowsuserinterface/windowing/dialogboxes/aboutdialogboxes.asp >Dialog boxes usually belong to a predefined, exclusive window class. >The system uses this window class and its corresponding window procedure for both modal and modeless dialog boxes. >When the function is called, it creates the window for the dialog box, as well as the windows for the controls in the dialog box, >then sends selected messages to the dialog box procedure.