If a long board has a nasty twist in it, you can take it to the band saw first. You'll get it alot closer to flat before going to the jointer that way. I've also run them through the planer once or twice first to get something that resembles flat before moving to the jointer.
with a twisted board, you don't start making full passes, but some part of the board starts ahead of the knives (start with the twist on that end ahead of the cutterhead, ideally starting on a spot of the board that matches the plane you want to end up with), and take the sticking down part off of the trailing twist. then the board is turned end for end, and the same done on the other end. Not much different than taking bow out of a board, you just have to be more aware of trying to keep the twisted board flat in the same plane. You can make full passes, but it ends up taking more off the board. Theoretically you can do it with full passes, but it's hard to keep the board on the same plane all the way through with the twist. some boards are just too twisted to get much out of anyway.