ChartViewer is a Java Bean and a SWING component the extends the SWING JLabel control. It is for viewing ChartDirector charts and for providing tool tips, hot spots, viewport and programmable track support.

ViewPortControl is a Java Bean and a SWING component that provides a user interface for visualization and control of the ChartViewer viewport.

WebChartViewer is the server side class library that works with the browser side JsChartViewer control. Its main functions are to support viewport, partial chart update (AJAX update) and programmable track cursor.

WebViewPortControl is the server side class library that works with the browser side JsViewPortControl. It provides a user interface for visualization and control of the WebChartViewer viewport.