This demo uses OpenLayers.Control.TimeSliderBar with OpenLayers.Layer.GeoRSS and OpenLayers.Layer.TimedPointTrack. The track is created by connecting the points of the GeoRSS feed, and the points can be tracked based on their temporal attribute.
The above input box allows the input of a URL to a GeoRSS feed. This feed can be local to the HTML page -- for example, entering 'xml/track1.xml' will work by default.
The example shows a track, displayed as a line connecting the points of the feed. The time-select control in the lower right 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.