Schematic diagram of the visualisation web server. The user's client machine is on the left of the vertical line, while the server is on the right. The WWW page containing the form to be filled in by the user is illustrated at top left, while the browser (in this case WebSpace) which receives the VRML from the server is at lower left. The IRIS Explorer map invoked by the web server is shown at bottom right on the server machine. The steps in the process are numbered on the diagram.