Hi David,
The task of sorting out the clients among the available Lightstreamer boxes in the cluster is provided by the LoadBalancer chosen. You can refer
here for more details on the various scenarios.
Yes, it is a common practice among our customers, to have in the production environment a cluster of Lightstreamer machines beyond a LoadBalancer.
The Lightstreamer nodes in a cluster follow the share-nothing pattern. They are totally independent. It's the client subscriptions that drive the Item base handled by each server instance and in turn requested to each Data Adapter.