The Sensex has slipped back into the negative zone and is now down 80 points at 17,447.The NSE Nifty is down 29 points at 5,104.Infosys has soared 4.5% to Rs 1,548. Satyam has surged over 4% to Rs 407, and TCS has rallied nearly 3% to Rs 909. Wipro is up over 1% at Rs 415.Ranbaxy has gained 2% at Rs 381. DLF has plunged 4.6% to Rs 806.Bajaj Auto has tumbled 3% to Rs 2,210, and Larsen & Toubro has dropped 2.7% to Rs 3,530.Mahindra & Mahindra has shed 2.5% at Rs 642. Tata Steel has slipped 2% to Rs 756.HDFC and Hindalco have declined 1.7% each to Rs 2,875 and Rs 161, respectively.Reliance Energy has dropped 1.5% to Rs 1,956. Hindustan Unilever, ICICI Bank, SBI and NTPC are down over 1% each at Rs 197, Rs 1,093, Rs 2,132 and Rs 204, respectively.