The Sensex at the Bombay Stock Exchange opened 120 points, or 0.7 per cent higher, at 18,091, this morning, following positive Asian markets. Remaining firm, the Sensex stood 135 points, or 0.8 percent in the green, at 18,107, a short while ago.Key stock indices in Japan, Hong Kong, South Korea, Indonesia, Taiwan, and Singapore were up by between 0.2 percent and 1.2 percent, on positive economic data in the US and China.