Not every contract trades on mutiple platforms. You have a choice of the front end used to access the exchange, not what exchange to trade on in most cases. What are you looking to trade?
https://clearport.nymex.com/access/login.asp ACCESS is on GLOBEX/CME now. So all electronic NYMEX Crude is traded this way, as far as I know.
I'm just trying to organize what markets are electronic and mini's, and their respective margins, hours, etc.. any good links??
Do you want me to trade your account too? http://www.nymex.com/index.aspx http://www.cme.com/ http://www.cbot.com/cbot/pub/page/0,3181,972,00.html