Greetings fellow e-book perverts

I can not see that my question has been asked before, if so i apologize.
My question is: When in dual-mode with an e-book on one side and notes on the other, are the two pages independent of each other or is each page of the e-book linked to a separate note-page, and if so, is it possible to link multiple note-pages with each page of the e-book?
Thanks in advance