Telecomunicaciones y tecnología
S&P 500, Nasdaq up but Dow off on Wal-Mart
* Shares of Wal-Mart Stores Inc , the world's biggest retailer, slid 7.5 percent to $51.38, leading the Dow into negative territory.
* U.S. President-elect Barack Obama again made a push for a massive economic stimulus plan, though there was some nervousness among investors as specifics of his plan remain unclear.
* The Dow Jones industrial average fell 27.08 points, or 0.31 percent, at 8,742.62. The Standard & Poor's 500 Index added 3.08 points, or 0.34 percent, at 909.73. The Nasdaq Composite Index jumped 17.95 points, or 1.12 percent, at 1,617.01.
(Reporting by Deepa Seetharaman; Editing by Leslie Adler)