IP address recognition?

I am using my bots (web chat) inside of a membership program to track the progress of my users. I haven't gone live yet and I've been assuming that it will recognize the IP address of each user and continue the 'conversation' with the user from the last time they were in there, would this be correct? Or does it restart every conversation when reopened?

If so, is there a way around this? Like a set variable number for each user to enter perhaps in order to get their 'score' to date?