Is there really any usefulness in watching NASDAQ Level II screens these days? I am new to trading, and it seems that most of the prints, including big block transactions, happen on ECN's or alternate exchanges, with very little of the true volume actually being shown on the Level II screen, and, the MM's never actually show their true size, and as I understand it, trade themselves using ECN's to hide intentions. With all the games, is there any way to decipher short term momentum?