The Sensex opened with a positive gap of 41 points at 13,440. The index touched a high of 13,487, and is now up 64 points at 13,463.Satyam and Infosys have advanced around 1.5% each to Rs 433 and Rs 2,190, respectively.NTPC, TCS and Wipro are up a 1% each at Rs 140, Rs 1,086 and Rs 547, respectively.
