my dad and step mom have the same problem.
they share a windows pc, 1 itunes library. i set it up to where my step moms auto updates, and my dads is manual update. i dont know if this is gonna work once she adds more songs because she doesnt want his songs, and vice versai have no clue what is gonna happen when they try to add songs, but it is fine for now.
how do i set it up with a lets say "dads ipod" playlist to update when that ipod is plugged in, and "stepmom ipod" playlist to update hers?