Pen-based User Interface (PUI) is becoming more and more popular. This paper presents (the) universal analysis and specification of characters and structure of PUI. PIBG, a new interaction paradigm, is proposed as the framework for PUI. PIBG Toolkit is also developed as a PUI Software Platform. With the goal of high usability, several applications are developed with PIBG Toolkit. PUI provides a method for natural and concordant interaction, which could facilitate the development and applications of collaborative systems.
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