Upgrading from RH9

[<edwarner99 yahoo com>]

Hi,

Having to switch to Fedora from RH9 because of the
cost, I have a few questions.
My system is running DHCP and a Firewall.

1. Can I even do an upgrade from the CD's instead of a
complete install? 

2. What (configuration files) if anything do I need to
save?

3. Any guidance on the web--somewhere?

Thanks,

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