Ameritrade Holding Corp., an on-line discount brokerage, has signed a contract with MicroStrategy Inc. to develop personalized Internet- based financial services.

Among these would be round-the-clock stock alerts and the ability to respond immediately to these movements through pagers, cellular phones, and personal digital assistants.

"That's where the industry is going, and we plan to be there first," said Thomas K. Lewis Jr., co-chief executive officer of the on-line brokerage firm.

MicroStrategy offers software that queries and analyzes data base information and delivers it to internal users, customers, and business partners through various channels.

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