Information requested by a client is intercepted by a network server, which sends the request to the requested information source. The requested information is received and examined by the server to determine if the information is HTML format. If so, the server modifies the requested information by inserting format and request instructions then sends same to the client computer. The client uses the format and request instructions to send a request for supplemental information from a supplemental information source. The associated supplemental information is sent from the supplemental information source to the network client. The format instructions cause the requested information and supplemental information to be displayed in respective first and second display areas.