No, sorry for the confusion; I have now fixed my previous post.
sendMessage is provided by the Web Client Library as a method of the LightstreamerEngine object
http://www.lightstreamer.com/docs/cl...ml#sendMessage
A call to sendMessage by your client triggers, on the server side, the invocation of the notifyUserMessage method on your Metadata Adapter; this is supported both for java adapters and (as NotifyUserMessage) for remote .NET adapters.