Hi Emerson,

Yes, I confirm that more than one client can subscribe to the same Item and all these will receive the snapshot, upon request, based on the current status of the Item.

The difference is that for the first client the Lightstreamer server must rely on the Data Adapter to retrieve the current status of the Item, and expects one or more updates marked as snapshot and eventually an EOS signal.
For all the subsequent clients, the snapshot will be provided directly by the Lightstreamer server leveraging the current status of the Item maintained in its internal memory.

In other words, the subscribe method of the Data Adapter will be called only once.
The first client subscribing to a specific Item will trigger the call to the subscribe of the Data Adapter. All subsequent subscription requests of clients for the same Item will no trigger any subscribe call. When there will be no more clients subscribing that Item then will be called the unsubscribe method.
After that, an eventual new request for the same Item will cause a new call to subscribe.
Please refer to the schema at page 38 of General Concepts documentation for a concrete scenario of Data Adapter workflow.

Please let us know if you need any further clarifications.

Regards,
Giuseppe