For a quick overview of expert systems, connect to www.ghgcorp.com/clips/ExpertSystems.html or to EXSYS, Inc.'s site at www.exsys.com (click the Expert Systems link in the left navigation bar). (MultiLogic's site at www.multilogic.com is no longer available.) You can select a link to test-drive some simple expert system examples at www.intellix.com (click Demos in the left navigation bar). For additional information and links, jump to the site maintained by PC AI magazine at www.primenet.com/pcai. Acquired Intelligence,also has Web-based demos, such as an expert system that is designed to help you identify whales, at www.aiinc.ca/demos/whale.html.