Does Opera Mini operate on the BES or BWS?

I've had it work on both.

How do you set it up to work on one or the other??

There's no options in the program to tell it to use one or the other. If you are on a BES, it will always go through the BES (tested mine by going to whatismyip.com and verified an IP belonging to my company). If you don't have a BES, I guess it would go through BWS.

My default Blackberry browser is BWS, but Opera Mini still uses the BES proxy.

Thanks and good website to know.