Called by a Data Adapter to send an Item Event to Lightstreamer Kernel when the Item Event is implemented as an IIndexedItemEvent instance. 

The Remote Adapter should ensure that, after an Unsubscribe call for the Item has returned, no more Update calls are issued, until requested by a new subscription for the same Item. This assures that, upon a new subscription for the Item, no trailing events due to the previous subscription can be received by the Remote Server. Note that the method is nonblocking; moreover, it only takes locks to first order mutexes; so, it can safely be called while holding a custom lock. 

void Update(string itemName, IIndexedItemEvent itemEvent, bool isSnapshot);

void Update(string itemName, IIndexedItemEvent itemEvent, bool isSnapshot);

Function Update(itemName As string, itemEvent As IIndexedItemEvent, isSnapshot As bool) As void