Is there a command which allows me to update my iPod? For example: Say my iPod is plugged to my iMac. Then I buy a song from iTMS. My "Purchased" songs is synced ith my iPod. However when I eject my iPod it hasn't updated - and the recently bought song has not been loaded onto my iPod. So I'd like to know if there's a button/command that I can press/activate between steps 2 and 3, so that the song gets loaded onto my iPod. At the moment the only workaround I have is to disconnect then immediately reconnect my iPod.