its not possible
the most he can only trace it back to your ISP exchange centre,
this is the max
which i think most likely is queenstown exchange, unless ur hosting
ur own connection
maybe u can start by playing some trace route softwares, for
example u type in www.yahoo.com, u will see queenstown exchange,
den some msia location, then china n finally www.yahoo.com server
in california if i neber remember wrongly
tats why i say he cant ID u to your exact location, because only ur
ISP has it,n that is also thru ur username...
moreover ur IP address is dynamic, which means its different
everytime u login
tell him to go fark spider, if he can do it, he shld make an
appointment wif bill gates for job interview