This demo uses OpenLayers.Control.TimeSliderBar with OpenLayers.Layer.TimedWMSTrack. The track image comes from a WMS, and the position along the track comes from a feed with timestamps and positions.
The example shows a track, displayed as a line connecting the points of the feed. The time-select control in the lower left can be used to select a certain time for the displayed layers, either roughly by dragging the bar, or step by step pressing the + and - icons.