Because of the spurious WM_MOUSEMOVE message that is generated when a window is created. In this case, the spurious message is a good thing, since it lets us do our mouse work at window creation.
October 14th, 2003
Answer to previous exercise about the mythical WM_MOUSEENTER message
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Raymond has been involved in the evolution of Windows for more than 30 years. In 2003, he began a Web site known as The Old New Thing which has grown in popularity far beyond his wildest imagination, a development which still gives him the heebie-jeebies. The Web site spawned a book, coincidentally also titled The Old New Thing (Addison Wesley 2007). He occasionally appears on the Windows Dev Docs Twitter account to tell stories which convey no useful information.
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