I have a slight problem. My cousin and I are trying to download something on my MacBook, but he lives in VA and I live in NC and we won't see each other for a few weeks. He's trying to download something for me by screen sharing, but he has iMessages on his MacBook Pro (Lion), and I have iChat on my MacBook (Snow Leopard). Is there any way he can control my screen? There isn't that option in iMessages, which he doesn't want to uninstall. Thanks!