EISs stands for Environmental Information Systems. In general we incluse every system containing dat and/or information on the envronmiens an EIS. Most lykely these are accessible through the web, therefore every EIS is referenced by an web address (URL). Can be a collection of webpages (sometimes refered to as (geo)portals)with text, graphics, tables, maps and or access to databases or the like.
In the first workshop an EIS is defined in short as:
An EIS is a group of components that interact to produce information about the environment. Components can be maps, data visualisation, clear information