When they are logged off their cookie is gone. Without that you are not going to get any info. I'm sure somoen could come up woith something that would match the IPs of known users but then you run into the rpoblrem is they are on dial-up and have different IPs all the time. No 100% way of doing it, I'm afraid.
And if they are lurking it would show them as a Guest so you still see what they are doing.
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