Salomon Smith Barney has added trading capabilities to its Internet brokerage site, and American Express has established one for the first time.

The 600,000 investors with Salomon Smith Barney's brokerage worldwide can now make stock, bond, and mutual fund trades around the clock over the Internet. The Citigroup Inc. unit rolled out the on-line service because of requests from customers, said Steven Clifford, senior vice president and director of interactive marketing for the brokerage.

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