In scrutinizing the technology and telecom industries, antitrust enforcers have a huge market to examine. They are expected to look at everything from consolidation in the wireless sector _ including handset exclusivity deals, such as AT&T Inc.'s contract with Apple Inc. making it the sole U.S. carrier for the iPhone _ to Google Inc.'s ever-expanding clout on the Internet. "Antitrust enforcers tend to look at companies with the most significant market share," said David Turetsky, co-chair of the antitrust practice group at Dewey LeBoeuf and a former deputy assistant attorney general in the antitrust division under the Clinton White House. "Wherever you have market power, there are just more possibilities for anticompetitive issues." John Briggs, co-chairman of the antitrust group with Axinn, Veltrop & Harkrider LLP, said he would not be surprised to see the Justice Department also turn its sights back to Microsoft Corp.