tin tin, your IP address is logged every time you post a message on here and with that IP address and the co-operation of your ISP I could find out who you are through a search of your ISP's log files.
Most ISP's will not give this information out as it is protected data but most will do so if ordered by a court if there was any leagal requirement to do so. For example if the police were investigating a criminal act and the use of this forum was a part of the criminal act then they could possibly ask a judge to issue an order to the ISP to reveal the identity of the person.
Never had to do this yet but it is an option should anyone think that they can use these forums to continually abuse and slander someone. You haven't got something to worry about have you?
As this is a computer and internet question I am moving this to the appropriate forum.
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Capt PPRuNe
aka Danny Fyne
The Professional Pilots RUmour NEtwork