Yes there is a way, but it’s not very easy. Switching Session context seems to be a hassle at the moment. We’re discussing reaching into another Session context in this thread: Calling a method as another WebSession?
As far as examples, I can offer TP_WebKit which has a MessageAllSessions function. This example shows how to clear the session context, establish one, and send it a message. As far as I know, Xojo does not have an official example for how to do this.