A few kernel branches may be are being developed in parallel. For example, as of 13th 27th of JuneAugust, 20062007, there are four few active branches:* stable, based on RHEL4-2.6.9* stable, based on RHEL5-2.6.818* developmentstable, based on vanilla 2.6.1618* FC5development, based on latest Fedora Core 5 kernel2.6.22