"Invisible" <voi### [at] devnull> wrote in message 
news:4936b37a$1@news.povray.org...
>>>> From there, depending what records the ISP keeps, they can probably 
>>>> tell what username was usign that IP at that time.
>>>
>>> This is the part that I doubt.
>>
>> Why?
>
> What use would an ISP have for recording this information?

Legal complience
Billing records
Troubleshooting
Data mining
Because they can

The systems log logins and logouts automatically, along with IP address, 
probably the client PC's name and OS. There's no manual intervention and the 
logs will probably roll over after a pre-defined period (probably quite a 
large one)

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