well if your a system admin and you check the logs and you see someone from zzz.zzz.zzz.zzz
has been guessing passwords you your netbios account. depending on the servarity he will probibly trace you... find that you are eather behind a proxy or not and then eather report it to the fbi, police, whatever. or send a nice eamil to your ISP... they can and posibly will cancell your account