James J. Ramsey said:
If there is are no Fedora plans for a Fedora RHN, then
rhn_applet and rhn_register should have not even made
it to the first beta, let alone the third.
rhn_applet can (and as shipped it Test 3 does, IIRC) look at yum
repositories for updates.
Looking in the archives gives the indication that at least for the first
FC release it was planned to have a RHN channel for errata. I don't know
if that has changed or not.