During the lunchtime rush at his sushi restaurant in Scripps Ranch, Calif., Hui Choe suddenly makes a run for the office behind the kitchen. A surprise visit from the health inspector? Nah. The stock markets are about to close, and Choe's wireless Quotrek has beeped, signalling that America Online is up $4, to $90. Choe whips out his other wireless device, a two-way pager, punches a few buttons, and in a matter of seconds he has sold out his shares in AOL and used the proceeds to buy on-line music retailer N2K. Trade confirmation zings back from brokerage Muriel Siebert, and Choe gets back to his fish.
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