Abstract. This paper introduces a prototype of a distributed user interface (DUI) on dual devices, a workstation and a Windows Mobilepowered smartphone. By porting the XML-compliant GUI system Views to the smartphone platform, we explore one possibility of distributing GUI components among heterogeneous devices. We describe problems and conclusions from designing and implementing the system. Key words: Distributed user interfaces, ubiquitous computing, XML GUI description, mobile computing, adaptive user interfaces, smartphone, Views