Thanks Chris and rneil for the streaming primer. I actually think I finally get it. (And how embarrassing too; but that's often the way it feels when the light shines.)

And on a lesser note, thank you pmbuko. I've been going out of my way to always say "iTouch" - just because it drive mac-o-philes nuts. It had been losing its allure; but now I'm re-energized!