def pos(self, x=None, y=None):
        u'''Move or query the window cursor.'''
        if x is not None:
            System.Console.CursorLeft=x
        else:
            x = System.Console.CursorLeft
        if y is not None:
            System.Console.CursorTop=y
        else:
            y = System.Console.CursorTop
        return x, y