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The system automatically provides the keyboard interface for all modal dialog boxes.
It does not provide the interface for modeless dialog boxes unless the application
calls the IsDialogMessage function to filter messages in its main message loop. This
means that the application must pass the message to IsDialogMessage immediately
after retrieving the message from the message queue. The function processes
the messages if it is for the dialog box and returns a nonzero value to indicate
that the message has been processed and must not be passed to the TranslateMessage or DispatchMessage function.