The Sensex at the Bombay Stock Exchange today gained 29 points in the late morning trade on continued buying by funds and retail investors. The 30-share index, which had gained 48 points in its opening trade, rose by 29 ponits to 18,791 when reports last came in.Similarly, the wide-based National Stock Exchange Nifty Index moved up by 9 points to 5,712 a short while ago.