def size(self, width=None, height=None):
        u'''Set/get window size.'''
        sc = System.Console
        if width is not None and height is not None:
            sc.BufferWidth, sc.BufferHeight = width,height
        else:
            return sc.BufferWidth, sc.BufferHeight

        if width is not None and height is not None:
            sc.WindowWidth, sc.WindowHeight = width,height
        else:
            return sc.WindowWidth - 1, sc.WindowHeight - 1