Quote from MartinWeinberg:
All order that come in electronically are routed through the SuperDOT system. These orders appear in aggregate on the clerk's monitor, very similar to a level II screen. All the specialist knows is how much size in total he has available to him at a given level.
It's all about speed. If Firm A's routing can get the order into the system faster than Firm B, then Firm A will have an advantage, and will get their orders filled first.
DISAGREE, execution speed of equipment is only part of equation, i.e if you have a trader w/ slowest reaction on fastest execution tech, he would still suck. what you are inferring is he who has the best trading platform wins. not true.