Hi Tony,

Actually, when the are no more active subscription, the Lightstreamer Server notifies the Data Adapter on the unsubscribe method.
The Data Adapter is supposed to stop sending updates for this item. Any subsequent update sent by the Data Adapter for the unsubscribed item will be just discarded by the server. (see the update or the smartUpdatye methods in the ItemEventListener interface).
In other words, is up to the Data Adapter to track which item is not subscribed anymore by the Lightstreamer Server and avoid to send updates for it, but take the required action in case.

cheers
Marco