PUBLIC MARKS with tags backplane & ubiquitous

Documents are the primary metaphor in OpenDoc.[8] Applications all but disappear: They look like task-oriented stationery on the desktop, such as icons representing ruled paper, a spreadsheet, drawing paper or a database form. (The applications themselves may end up in a new part-handler directory.) To start a new document, you choose the type of stationery you want; that sets which application is your "root part."