...
On the other hand, sometimes we prepare a GlastRelease v*r*p*, with the p* which means one of the constituent package is branched. And the release manager HEAD is expected to be a preparation for this new GlastRelease v*r*p*, and the release manager LATEST is expected to be a preparation for HEAD... so it is expected that some tags on branches will be used in LATEST, then in HEAD, then for GlastRelease v*r*p*.
Places where there is information about tags
About CVS branches.
About Release Manager.
Within CMT introduction, when clicking on "Tagging Conventions".