Re: Is my account linked to my friend's account if I opened it on his PC?
Depends on how many times you have shared the same computer. The more its been shared the higher the risk. No way to know for sure though, only time can tell.
Re: Is my account linked to my friend's account if I opened it on his PC?
Different user account, different IP, all other registration info - but OP is saying he has used his account on the same PC in the past...I would bet there is some link