As far as I've understood, the list of items to be subscribed should be sent by the client(in may case a web client)

Is it possible to do the following scenario using lightstreamer?

Depending on the username password sent by web client, lightstreamer connects to the database and gets the list of items relevant to that user. then it sends them back to the client or subscribe those items automatically... and pushes data accordingly. (i.e. web client will send us only the username and we have to subscribe the relevant items for that user)