Can I delete *FC3* files from my FC4 system?

[Nat Gross]

On 1/25/06, Paul Howarth <paul at city-fan.org> wrote:
<snip>
> I would suggest that you updated your yum configuration to include the
> "fc4" versions of the third-party repositories you use, then do a "yum
> update". That should replace most of the "fc3" packages with "fc4"
> versions.
1. Didn't the FC4 upgrade change the yum url's?
2. Looking at the url's in /etc/yum.d/*.repo, there is no hint of fc3
or fc4 in the url. How do I know where (and if) to point to for fc4.
Thanks,
-nat
ps. hope I can do it with yum. If not, Charles has given me some
tedious homework!