code: protected Object getPageInput( String pageInputName )
      {
          return _pageInputs != null ? _pageInputs.get( pageInputName ) : null;
      }
docs: Get a page input that was passed from a Page Flow action as an "action output".
  
  @param pageInputName the name of the page input.  This is the same as the name of the "action output".
  @return the value of the page input, or <code>null</code> if the given one does not exist.