Segment/passing to method problem

[eluser]rossmurphy[/eluser]
Say i have a reg user method called index and then a method called process. index loads the view that contain the reg form then when submitted form calls the process method....then depending on the outcome will either call the index method and pass an array of new params to merge with the exisiting array to be passed into the views (such as errors) or it will redirect the user to a confirmation/activaion page....