CHATTING ON YAHOO,MSN,G TALK MASSENGER
these messengers works in dis way,
you------->messenger's server------>your friend
if u will do d previous operation then u will find messenger's ip address.
here,u may use social engineering,
social engineering is d next chapter but here a small introduction.
social engineering mans making some1 fool and hacking him,
in dis messenger case [mind it most of d messenger follow dis way]simply say your friend 2 send a file or 2 receive a file,if he agreed then just do previous operation.
when he will send u d file then it will not come through messenger ,it will directly come 2 u and by writing netstat -n,u may find 1 more ip address that is of your friend.
or there's a 1 more method,u may say him 2 mail you or write a mail 2 him and use read notify thing,which i told previously and now wen he will send u mail or wen he will reply 4 your mail,u can get his ip address.