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 SetFocus()             Selects a window as focused
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   Syntax:              SetFocus( <hWnd> )  --> <hWndPrev>


   Parameters:

   <hWnd>               Identifies the window to receive the keyboard
                        input. If this parameter is 0, keystrokes are
                        ignored.

   Returns:

   <hWndPrev>           Identifies the window that previously had
                        the focus.

   Observations:        This function sends a WM_KILLFOCUS to the
                        window that previously had the focus, and
                        a WM_SETFOCUS to the window that recieves
                        the focus.

   Source code:         SOURCE\\WINAPI\\SetFocus.c

   See also:            GetFocus()