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google is your friend
edit: if i were you i should not gameshare with anyone.. bcs they/you need to have yours/their account as primary system and thats the problem.. But once he change or you change your password then it will be locked... you/they may have their bank account locked to the account and you or they can scam each other and buy games.
So my suggesion is, if that is a very good friend then its cool, if not then dont do it..