I'm trying to understand the 'DVD Store' sample that comes with seam distribution. The EditCustomerAction.saveUser() could return the "success" string, but I can't find its reference in the pages.xml. How does Seam know which page it should forward to?

 public String saveUser() {
 if (!isValidNamePassword()) {
 facesMessages.add("User name #{customer.userName} is not unique");
 return null;
 }

 try {
 em.persist(customer);
 sessionContext.set("currentUser", customer);
 Actor.instance().setId(customer.getUserName());

 identity.setUsername(customer.getUserName());
 identity.setPassword(customer.getPassword());
 identity.login();

 facesMessages.addFromResourceBundle("createCustomerSuccess");
 return "success";
 } catch (InvalidStateException e) {
 InvalidValue[] vals = e.getInvalidValues();
 for (InvalidValue val: vals) {
 facesMessages.add(val);
 }

 return null;
 } catch (RuntimeException e) {
 ctx.setRollbackOnly();

 facesMessages.addFromResourceBundle("createCustomerError");

 return null;
 }
 }