SAN FRANCISCO - Morgan Stanley Dean Witter Online has promoted Darrell Davis, a senior vice president and director of technical operations, to executive vice president and chief technology officer, succeeding John MacIlwaine, who has left for an Internet start-up that has not yet been named, a spokeswoman said.

Mr. Davis said one of his primary tasks will be to integrate Discover Brokerage's trading systems with those of the parent company, Morgan Stanley Dean Witter & Co. He also is to help facilitate the sharing of customer data among company departments to encourage cross-selling.

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