1. In a computer managed communication network with user access via a plurality of data processor controlled interactive display stations and with a system for displaying documents transmitted to said display stations from locations remote from said stations, said documents including a sequence of at least one display screen page including images, the improvement comprising: means for transmitting to a receiving one of said display stations, a page comprising at least one identifier representative of a universal image, a library of universal images and identifiers respectively representative of each of said images at a location remote from said receiving display station, a network library server for fetching said library and for transmitting said library to said receiving display station, and means associated with said receiving display station for retrieving from said library the image represented by said one identifier, whereby said retrieved image is included in said page.