code: private void evaluateSync(String data){
          if (!m_sync && data!=null && data.contains(org.opencms.gwt.client.rpc.CmsRpcAction.SYNC_TOKEN)){
              m_sync=true;
          }
      }
docs: Checks whether the request data contains the sync RPC token.<p>
  
  This method was introduced to allow synchronised RPC calls within vaadin.
  
  @param data the request data