code: public boolean fbml_setRefHandle(CharSequence handle, CharSequence fbmlMarkup)
      throws FacebookException, IOException {
  
      return extractBoolean(this.callMethod(FacebookMethod.FBML_SET_REF_HANDLE,
                                            new Pair<String, CharSequence>("handle", handle),
                                            new Pair<String, CharSequence>("fbml", fbmlMarkup)));
  
    }
docs: Associates a "<code>handle</code>" with FBML markup so that the handle can be used within the
  <a href="http://wiki.developers.facebook.com/index.php/Fb:ref">fb:ref</a> FBML tag.
  A handle is unique within an application and allows an application to publish identical FBML
  to many user profiles and do subsequent updates without having to republish FBML for each user.
  
  @param handle a string, unique within the application, that
  @param fbmlMarkup refer to the FBML documentation for a description of the markup and its role in various contexts
  @return a boolean indicating whether the FBML was successfully set
  @see <a href="http://wiki.developers.facebook.com/index.php/Fbml.setRefHandle">
  Developers Wiki: Fbml.setRefHandle</a>