[HELP]

ok another question
So around a month ago, a normal day, talking to my friends on msn. Then all of a sudden ' i ' started speaking and sending messages without touching my keyoard!! i later found out it was some other hacker though...
It didnt show up in the text field but i could see the messages ' he ' sent
He could see what i had written, i had a whole conversation with him!!
How would i do this?! it is so cool?!?

Someone probably had the password to your account, and you were both logged in chatting from the same account. You got hacked.

most of the time MSN dont allow you to be logged in at 2 seperate locations, but appearently you was using something that allows multiple locations