Rising for the second straight session, the Sensex at the Bombay Stock Exchange ended with a slim gain of 22 points, or 0.1 percent, at 16,439, amid positive Asian markets, today. The Nifty at the National Stock Exchange moved up 4 points, to 4,990.Stock markets in Japan, China, Hong Kong, South Korea and Singapore rose between 0.5 percent and 1.5 percent.