HP agreed to buy ArcSight for $1.5 billion to gain security software and serve the growing data center market. Bharti Airtel partnered with IBM to manage computing technology across Airtel's African markets. The Sensex crossed 19,000 for the first time in 32 months on strong factory output numbers and gains in banking, energy, and realty stocks. Steel producers in India are pursuing innovation and retail expansion to deal with falling demand and global price linkage.