I have Windows Vista with 2 user accounts. If I am running iTunes on one account, I am not able to launch iTunes when I switch to the other account (leaving iTunes running on the first account). Why is this a limitation? And is there any way around it? I specifically would like to have both running at the same time on one computer so I can use the Remote App to control/switch between the 2 libraries without having to go to the computer to end iTunes on one account, switch to the other account and launch iTunes on that account.