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Item A User-Interface Toolkit in Object-Oriented PostScript Owen M. Densmore(Blackwell Publishing Ltd and the Eurographics Association, 1987) Densmore, Owen M.; Rosenthal, David S. H.Only the diehards want to develop applications using basic window system facilities. The preferred approach is a higher-level"toolkit" of user interface components, such as menus and scroll bars. Experience with current toolkits shows the need for an object-oriented interface to these components.NeWS, the Network/extensible Window System, allows user interface components to be programmed in PostScript. Fortunately, object-oriented interfaces are natural in PostScript, and they have been used to create a toolkit with some novel properties. Among these are the use of concurrent processing and run-time inheritance of component methods."Postscript is the future of words on paper."Arthur C. Clarke