Strutsで複数のウィンドウ間のデータのやり取りについて

<action
  attribute="CreateMemberForm"
  input="/visitor/CreateMember.jsp"
  name="CreateMemberForm"
  path="/CreateMemberAction"
  scope="session"
  type="com.hogehoge.CreateMemberAction"
  validate="false">
    <forward name="BackFirst" path="/visitor/CreateMember.jsp" />
    <forward name="BackSecond" path="/WEB-INF/jsp/visitor/CreateMemberDetail.jsp" />
    <forward name="Confirmation" path="/WEB-INF/jsp/visitor/CreateMemberConfirmation.jsp" />
    <forward name="GoSecond" path="/WEB-INF/jsp/visitor/CreateMemberDetail.jsp" />
    <forward name="Sucess" path="/visitor/CreateMemberSuccess.jsp" redirect="true" />
</action>

public ActionForward execute(
  ActionMapping mapping,
  ActionForm form,
  HttpServletRequest request,
  HttpServletResponse response)
  throws Exception {

  //完了時に返されるAcitonForward
  ActionForward forward = null;

  //Validation用ActionErrors
  ActionErrors errors = new ActionErrors();

  //Formからデータを取得する
  CreateMemberForm theForm = (CreateMemberForm) form;

  //HttpSession
  HttpSession session = request.getSession();

  //ステータスに応じての処理
  switch (Integer.parseInt(theForm.getStatus())) {
    case 0 : //詳細情報入力画面へ
      //Validateを行う
      errors = theForm.validate(mapping, request);
      if (errors.isEmpty()) {
        theForm.setStatus("1");
        //Formのreset()で初期化をしていないので、requestがnullだった場合に値をfalseにする
        if (request.getParameter("hogehoge") == null) {
          theForm.setHogehoge(null);
        }
        forward = mapping.findForward("GoSecond");
      } else {
        saveErrors(request, errors);
        forward = mapping.findForward("BackFirst");
      }
      break;
    case 1 : //確認画面へ
      //Validateを行う
      errors = theForm.validate(mapping, request);
      if (errors.isEmpty()) {
        theForm.setStatus("2");
        //Formのreset()で初期化をしていないので、requestがnullだった場合に値をfalseにする
        if (request.getParameter("hogehoge2") == null) {
          theForm.setHogehoge2(null);
        }
        forward = mapping.findForward("Confirmation");
      } else {
        saveErrors(request, errors);
        forward = mapping.findForward("BackSecond");
      }
      break;
    case 2 : //完了画面へ
      if (request.getParameter("submit") != null) {
        //Validateを行う
        errors = theForm.validate(mapping, request);
        if (errors.isEmpty()) {
          //処理を実行
          if (!doSave(theForm, request)) {
            SendMail.sendMail(theForm);
            session.removeAttribute(mapping.getAttribute());
            forward = mapping.findForward("Sucess");
          } else {
            forward = mapping.findForward("SystemError");
          }
        } else {
          saveErrors(request, errors);
          forward = mapping.findForward("BackFirst");
        }
      } else {
        //最初に戻る
        forward = mapping.findForward("BackFirst");
      }
      break;
  }

  return forward;
}