A group of state attorneys general urged a federal judge on Tuesday to hold Microsoft Corp. to a 2002 antitrust settlement another five years so that the company can't stymie embryonic Web 2.0 rivals of its Windows operating system. According to six states -- California, Connecticut, Iowa, Kansas, Minnesota and Massachusetts -- and the District of Columbia, Microsoft could use its Internet Explorer browser as a "chokepoint" to block moves that might unseat Windows dominant position on the desktop.