you can have more then one ipod linked to the same itunes. the app is smart enouph to know they are different, and will give them different settings. remember, you can have all the ipods you want linked to one itunes, and with different things on each, but you can only link an ipod to one itunes install at a time. as soon as you link it to a new itunes install, the ipod will not update on the other install.