Keep track of ScriptSessions for one browser

Is there a way to send back information to only one browser even though multiple browsers are on the given page?

My problem is that I have multiple users logged in accessing their data.  If there is an update for any given user, I don't want it to be sent to all users currently logged in.

I saw a post on how to deal with this if the thread is started by DWR, but in my case it isn't.  Also, in the javadoc there is mention of getScriptSession(String id) but I can't find the method anywhere.  Maybe I could use this to determine which ScriptSession I need to send updates to.

Thanks,

Erlend