1.   Speculation that Tencor might be taken over drove trading in Tencor options earlier this week.

2.   That could drive trading in computer-related stocks.

3.   The companies earned more from brokering stocks as a rising market drove up trading levels.

4.   Still, a few catalysts drove trading.

5.   The early surge drove trading in other markets from South America to Wall Street.

6.   While interest rate concerns dominated Wall Street, corporate news also drove trading Wednesday.