Family is visiting from the U.S., I am stationed in Japan, and I bought them Ipad2's. They didn't bring their laptops as we didn't realize it would require a synch with their iTunes accounts. If they use my laptop, but are signed into their iTunes accounts will registration, etc. work for them? I want them to be able to enjoy their Christmas gift, but don't want to set them up for failure and hassles long term. Any insights into this would be greatly appreciated.