Of course not - are you deliberately being obtuse?
You asked what was the difference between playing streaming music (or other programs) on your desktop and on an iPod.
No, I asked what's so special about Ipods. I asked if it is merely an mp3 player, which it appears is all it is. I mentioned I can play mp3s on portable devices already, and that i can download music for those devices already. I don't get what the ipod has introduced that didn't exist already. Hell, I had a portable mp3 player in 1999. I don't get what all the hype is about. I thought maybe it could do something I wasn't aware of.