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 SetClassWord()         Changes a window word value
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   Syntax:              SetClassWord( <hWnd>, <nIndex>, <nNewValue> )
                                        -->  <nOldValue>

   Parameters:

   <hWnd>               The handle of the window

   <nIndex>             Specifies the zero-based byte offset of the word value
                        to change.

                        Valid values are in the range zero through the number
                        of bytes of class memory, minus two (for example, if
                        10 or more bytes of extra class memory were specified,
                        a value of 8 would be an index to the fifth integer),
                        or one of the following values:

                        Value   Meaning

                        GCW_HBRBACKGROUND  Sets a new handle of a background
                                           brush.
                        GCW_HCURSOR        Sets a new handle of a cursor.
                        GCW_HICON          Sets a new handle of an icon.
                        GCW_STYLE          Sets a new style bit for the
                                           window class.

                        #define GCW_HBRBACKGROUND       (-10)
                        #define GCW_HCURSOR             (-12)
                        #define GCW_HICON               (-14)
                        #define GCW_HMODULE             (-16)
                        #define GCW_CBWNDEXTRA          (-18)
                        #define GCW_CBCLSEXTRA          (-20)
                        #define GCL_WNDPROC             (-24)
                        #define GCW_STYLE               (-26)

   <nNewValue>          Specifies the replacement value.

   Returns:

   <nOldValue>          The return value is the previous value of the
                        specified word, if the function is successful.
                        Otherwise, it is zero.

   Observations:        The SetClassWord function sets a word value at the
                        specified offset into the extra class memory for the
                        window class to which the given window belongs. Extra
                        class memory is reserved by specifying a nonzero value
                        in the cbClsExtra member of the WNDCLASS
                        structure used with the RegisterClass function.

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

   See also:            SetClassLong() SetWindowWord() SetWindowLong()