The Sensex and Nifty opened slightly lower today amid mixed global signals. The Sensex started trading today at 84,598.25, dropping 38.60 points, and the Nifty was at 25,841,650, down 23.05 points. The Indian rupee was trading today at 90.38 against the dollar. IT stocks like Infosys and TCS gained, but Sun Pharma and auto stocks declined.