OroSyncBundle uses GosWebSocketBundle to enable real-time websocket notifications between an Oro application server and users' browsers.
Out-of-the-box, OroSyncBundle triggers flash notifications about the outdated content if several users try to edit the same entity record simultaneously. It also sends flash notifications to all application site visitors once a developer turns on the system maintenance mode by a console's CLI tool.
Fore more information, please see online SyncBundle documentation.