1. A method to be practiced in an interactive display system for displaying on a raster-scanned or matrix address display device of a terminal, selected windows of data supplied to or generated by the system in the course of performance of one or more applications invoked by the user of the terminal, said data being supplied or generated in the form of coded information (text, image, or vector orders) and said system comprising formatting means for expanding selected parts of the coded information into full non-coded image representation of the data, means for storing bit image representation of said selected windows of data in a refresh buffer, and means for sampling the contents of said refresh buffer in synchronism with the scan of said display device in order to display the selected data portions mapped in said refresh buffer in corresponding viewports on the display device, said method being characterized in that said terminal is provided with storage space for on-demand storage and retrieval of bit image representations of all the data formatted by the application or applications invoked by the user whether or not such bit image representations are or will be displayed, presentation interface means is provided and rendered operable in response to such user invocation of an application to allocate presentation space within said storage and to store all formatted data associated with said application therein, and screen manager means is provided and rendered responsive to user input to identify and map the contents of those presentation spaces containing the image representation of said selected windows of data into said refresh buffer.