The Bombay Stock Exchange benchmark Sensex commenced higher by 142 points in its special trading session today on emergence of buying by funds at existing lower levels. The 30-share index, which had lost 434 points in the previous session, regained 142 points at 15,933 in the first five minutes of the special trading session. Both the BSE and the NSE decided to have a special ninety minutes trading to test the new additions to the National Stock Exchange's softwares.Similarly, the wide-based National Stock Exchange index Nifty rose by 42 points at 4760 points. Nifty had lost 126 points in yesterday's trading.