Wall Street ended on a flat note on Friday. The Dow Jones industrial average was down 17 points to 12,609. The Nasdaq moved up eight points at 2,371.Indian ADRs ended on a weak note. HDFC Bank plunged 3.3% to $95.40, and Satyam tumbled nearly 3% to $23.56. Infosys, Wipro, ICICI Bank, MTNL, Tata Motors, Dr.Reddy's and Tata Communications declined 1-2% each to $36.85, $11.98, $38.93, $5.10, $15.93, $15.05 and $26.98, respectively.