When looking at ProgramData\QlikTech\QVS, sessions_.log, I am trying to see if there is a unique machine identifier there. When I access a document using the IE Plugin, I can see the mac address and name of the machine. When I access a document using AJAX, I find this type of log entry:
i believe "127.0.0.1" is the clients ip address (in this case a connection from the local machine). it could be that it is the ip of the connecting qvwebserver though, which would be unfortunate.