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WORD pascal WinSetAttr(HWND hWnd, WORD attr, BOOL fRedraw)

  This function sets the value of a window's color attribute field.
See the section on attributes for more information.

Parameters
  hWnd is the handle of the window to query.
  attr is the color attribute to set the window to.
  fRedraw is TRUE if the window should be redrawn to reflect the new
   color, FALSE if not.

Returns
  The old attribute of the window, or 0 if hWnd was an invalid handle.