The won-dollar exchange rate showed limited volatility in the first session of Seoul's 24-hour foreign exchange trading system, with the newly added early-morning hours passing without sharp moves. The rate traded around 1,531 won per dollar as the newly added 2 a.m. to 6 a.m. window began, eased to the 1,529 level after 4 a.m., and returned to 1,530 by the close, according to combined data from Seoul Money Brokerage Services and Korea Money Brokerage Corp. Moves were sharper during regular Seou