I am currently contemplating replacing all my machines to Apple. I have a few questions. I currently use my windows machine to hold my media library. If i switch to Apple I would have all my media in iTunes. I'm not sure how to create multiple librairies, add file support for other media files (movies, music) I am switching to iTunes because I will get the Apple TV. When you use the ATV to view content does your computer need to be on? I'm not completely new to Apple products.