On a recent project I had to track variables through a multi step process and allow them to be backed up and restored within flash as a user moved back in the process.
After I couldn't find anything online to help I created an AS object that would basically do all the work for me while still allowing me to interact with only one point to change the variables.
This is the set of AS2 classes that I have created to assist me.
http://www.dougmckay.com/multiStep/