my sister and i both have ipod videos. we also have seperate accounts on my computer (win xp pro). would i be able to use my account on itunes to buy music for my ipod and then go to to her compuer account and buy music for her ipod? we both paid half for a prepaid card. and thats why i'm wondering if i can use the part i paid on my computer account and then log on as her on the computer but use my itunes account again to buy some stuff for her. edit: also, how does itunes keep track of prepaid cards? does it just add the balance of the card to an acount or do i have to spend it right away?