Suppose I have two LightStreamer servers load balanced using a standard web load balancer. This will give me a scalable solution - I can add more servers and failover is good.

But, how does LightStreamer handle that one of the servers needs to push updates to clients connected to server A and also clients connected to server B? Is there a backplane or message bus in play or is this scenario not possible?

I have been trying to find this in documentation, but can only find that "Lightstreamer Server is completely scalable. It is possible to create a cluster using normal web load balancing appliances.".