User Interface Design for Ubiquitous Computing W@PNotes, an Example

User interface (UI) design for ubiquitous computing is different from UI design for classical desktop-oriented applications. Interaction of a user with the system and applications takes place in a highly distributed fashion. Inputand output functionality is distributed over space, as well as time. Human-computer interaction (HCI) has to take place wherever needed and whenever needed. Due to the highly dynamic pattern of use, “classical” UI design for a single screen is poorly suited. This paper presents an architecture for designing applications bringing different inputand output channels to small devices, like mobile phones, as well as taking advantage from the benefits of a desktop computer. The W@PNotes system serves as a proof of concept for the successful use of this architecture.