I have a question about ESignal versus RealTick. Which ECN books (with depth) do these two packages give access to? Since I've used RealTick before, I know they give you access to at least ISLAND and ARCHIPELAGO. Anymore for RealTick now? I know ESignal has access to the ISLAND limit book and it was said that ARCHIPELAGO and INSTINET support would be added. What is the current state of ECN limit book access for these two packages? Thanks.