Just signed up for it. You have to go open a level 2 window, go to setup, click on servers, click on level 2 server, change it to NYSE open book in the right window, click ok, click ok, and you are done.
P.S
If anyone that works for Realtick is reading this thread, I have a question/request. Is it possible to integrate ECN's into Open Book? I know that data is provided by NYSE, but maybe your programmers can work around it.
shneed