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Window-Procedure Address
Every class needs a window-procedure address to define the entry point of the
window procedure used to process all messages for windows in the class. Windows
passes messages to the procedure when it requires the window to carry out
tasks, such as painting its client area or responding to input from the user. An
application assigns a window procedure to a class by copying its address to the lpfnWndProc member of the WNDCLASSEX structure. For more information, see Window Procedures.
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