> RHEL has at least three different versions; Desktop, Advanced and > Server. I couldn't find anything on the centos.org page about which of > the variants the source is rebuilt from. maybe a collect of all? > all 3+ RHEL versions are the same code, just different licensing/support contracts, and 'channels' on RHN where you won't get updates or RPMs for components that aren't in your 'channel'. centos is built from the most inclusive of these, "AS" as there are no subscriptions or other restrictions on updates.