This GIS uses Java for its execution. In case the GIS does not run, please download and install Java(J2SE JRE) from http://java.sun.com/j2se/1.4.2/download.html and refresh this page.
To "Zoom in", press the zoom button in the toolbar and drag a rectangle on the map with the cursor to zoom in. Similarly to "Pan", press the pan button in the toolbar and drag the map with the cursor. To select/deselect a layer, check/uncheck the checkbox next to the layer name and press the "Apply" button..
This GIS uses the GeoTools open source mapping toolkit.