Internet Products Inc. has introduced iPrism, a simple, transparent, plug-and-play internet access control solution that protects students from accidental or intentional viewing of inappropriate web sites. The iPrism server appliance filters web sites by their URLs, not by keywords or IP addresses, while providing flexible control that can be customized on a group-by-group or user-by-user basis. Analysts continually review web sites and categorize them according to content within a master database of more than 40 classifications. Database updates are automatically downloaded to the iPrism system each night through a subscription service. The system is compatible with virtually all existing network topologies, firewalls, and proxy servers. The unit simply plugs in to the IP network and requires no modification to existing software or hardware.