The visualization of document events via event maps uses the HyperGraph applet (see http://hypergraph.sourceforge.net/). This applet is loaded into your browser and executed by a special Java plug-in. Your browser must support this Java plug-in which is automatically installed when needed. You need Sun’s Java plug-in and JRE version 1.5 or better. Further, JavaScript needs to be enabled in your browser to be able to control the HyperGraph applet.