code: public static synchronized PageFlowControlContainer getControlContainer(HttpServletRequest request, ServletContext servletContext)
      {
          PageFlowControlContainer pfcc = (PageFlowControlContainer) getSessionVar(request, servletContext, PAGEFLOW_CONTROL_CONTAINER);
          if (pfcc != null)
              return pfcc;
  
          pfcc = new PageFlowControlContainerImpl();
          setSessionVar(request,servletContext,PAGEFLOW_CONTROL_CONTAINER,pfcc);
          return pfcc;
      }
docs: This method will return the <code>PageFlowControlContainer</code> that is acting as the
  control container for the page flow runtime.
  @param request The current request
  @param servletContext The servlet context
  @return The <code>pageFLowControlContainer</code> acting as the control container.