The major indexes traded slightly lower in late-morning action Wednesday. The Nasdaq was trading flat. The Dow sank 0.3%, the Dow and NYSE composite lost 0.2% each. Volume fell 4% on the NYSE and 1% on the Nasdaq compared with the same period Tuesday. HDFC Bank (HDB) rose 4% in nearly twice its typical turnover. The India-based bank operator is building on its late-July breakout after a two-week pullback. Acme Packet (APKT) advanced 2% in more