how does iTunes work?

Could you be a little more specific with your question? Are you trying to convert from one format to another> Just exactly what information are your looking for?

See these:
http://www.apple.com/quicktime/technologies/aac/
http://www.vialicensing.com/products/mpeg4aac/standard.html
http://craz.net/programs/itunes/alac.html

Then try Google for more like it, or related themes.

Unfortunately, this is a user to user forum only. We would really wouldn't have any knowledge of the specific's as to how the software & hardware interface specifically since we are not Apple employees. I'm sure this is proprietary information that Apple does not make public. The other thing is any speculation that I might offer is just that specualtion, & specualtion is against the "terms of use" of these forums. Sorry!

You are just too good, Buegie! Saved my backside ,again!

Thanks,
D

No problem, Deb.

Not quite sure if it was on point, but it was all I had.