Wall Street's main stock indices closed mixed at the end of today's trading, The Dow Jones industrial average ended the session up 37.07 points, or 0.14%, to 27,219.52 points. The Standard & Poor's 500 Index lost 2.18 points, or 0.07 percent, to 3,007.39.The Nasdaq Composite Index for technology shares closed up 17.75 points, or 0.22 percent, at 8,176.71 points. -