The ECOSIM server (demonstrator) is implemented on a UNIX workstation with a Xlib (X Windows) graphical user interface. Its basic user interface , display and analysis functionality is based on the ACA ToolKit, that also defines a major part of the Development framework.

The demonstrator already includes first data from the three validation case Stadt sites Berlin, Athens, and Gdansk; it also includes the first two very simple scoping models, namely the US-EAP ISC model, and the photochemical box model PBM as well as a simple optimization model for emission source control.

A number of map layers for the three sites provide the GIS background, and

observation data from the BLUME monitoring network in Berlin have been integrated.

The ECOSIM demonstration prototype includes:

• the graphical user interface
• hypertext help and explain function
• WWW access (built-in web browser)
• geographic information system
• object data bases including:
  • air quality monitoring data
  • model scenario management
  • animation of simulation model output
  • embedded expert system
• environmental simulation (forecasting) models