[Fedora-livecd-list] livecd fs format

[Mr Dash Four]

I have been using the LiveCD format extensively on majority of my 
machines throughout the years as it brings, among other things, enhanced 
protection to my root (/) image (as this is preserved throughout the 
life of the session and is restored after each reboot). I have, however, 
two fundamental issues I need to clear up:

1. How is the LiveCD file system constructed/built? I've read a variety 
of articles and it seems that it is close to the UnionFS (rom+ram 
"partitions"), but I am not sure that is used with the new versions of 
Linux. I see there are multiple loop mounts on the system, but can't 
figure out what they are.

2. My understanding is that all files that are modified in the "live" 
image are stored "separately" on a "ram partition". If that is indeed 
the case, can I look at what has been "modified" during the live 
session? This is easily visible and implemented in UnionFS by a simple 
"ls" on the ram (i.e. the read-write) part of the UnionFS, but I am not 
sure how this is organised on the LiveCD system.

Any help and advice on the above two issues is appreciated. Thanks!