In 1968 van Dam developed FRESS, a File Retrieval and Editing System. This was an enhanced multiuser timesharing version, still running on the IBM mainframe. It was later commercially reimplemented by Philips. FRESS was used by hundreds of faculty members and students for over a decade. FRESS featured dynamic hierarchy (like chapters/sections...), bidirectional reference links and keyworded links and nodes. On graphics terminals FRESS offered multiple windows and vector graphics.
FRESS was followed by the Electronic Document system, which supported color raster graphics and navigation aids.
Around 1986, Brown university announced Intermedia, a powerful hypermedia system for the Macintosh, running A/UX.