The Continental Chess Association, which runs a lot of those big opens you are talking about, has a page that would seem to answer most of your questions. I hope this helps
http://www.chesstour.com/foreignratings.htm
If you have more questions, email to
director@chess.us
I have seen that but I cannot find information directly for my case.
I'm foreign player and I have no fide or uscf ratings, my national rating is 1920. I have some questions about participating in such tournaments as Philadelphia Open, Chicago Open, World Open:
1. With what rating system will I play?
2. What will be my starting rating and in what under section can I play?
3. What K-factor will be?
1.