Timelines in ATF - kaisu1986/ATF GitHub Wiki
A timeline is a graphical representation of a time-sequence. Timelines contain groups that contain tracks that contain events: intervals, keys (zero-length Intervals), and markers (zero-length events that span all tracks in a timeline).
The ATF Timeline Editor Sample uses the ATF timeline facilities. For information on how the Timeline Editor uses these interfaces and classes, see Timeline Editor Programming Discussion.