write some php code

After a new user completes the registration form, the user ends up back at site's index page. What I'd like to have happen is the following: If the user is a guest: the first page they see is the registration form (with a link to the login form at the top of the page). Once the registration is submitted, the user should be directed to the first page of a survey they need to complete. The survey controllers and views already exist. My challenge is getting from the RegistrationContoller to the first SurveyController. I can make my site available via TeamViewer or RDP (if TeamViewer is too slow).