Abstract
The Drag-And-Dock design pattern provides a structured solution for designing graphical software applications with multiple content views that end users can freely arrange following a dragging and docking interaction approach. Copyright 2006 ACM.

Abstract
A map can be a major advantage when exploring unfamiliar environments. With the proliferation of mobile devices, such as PDAs and even mobile phones, the tourist industry is currently exploring the potential of new presentation strategies that will maximize the promotional appeal of tourism in their region. Mobile devices are capable of guiding a tourist when he/she is exploring a city. These mobile devices offer the potential for providing relevant 3D information to enable tourists to locate themselves within the city, rapidly navigate around the unfamiliar environment and explore it interactively. However, the computational resources of current mobile technology prevents the display of full complex 3D content in real-time, and thus selective rendering techniques must be adopted to ensure the viewer is provided with the perceptually most important information at interactive rates. This paper presents a series of experiments which help to identify key features of a scene for users to orientate themselves in that environment. Knowledge of these salient key features enable them to be provided to a user at a high quality while the remainder of the scene can be rendered in a much lower quality, saving significant bandwidth and computing power, without the user being perceptually aware of this difference in quality within the image.

Abstract
To improve their efficiency and competitiveness, organizations are increasingly interested in applications that support team work, usually know as groupware. Beside interoperability, familiarity with the application and users' mobility support, a feature that is of outmost importance in groupware is the notification of events produced by cooperative activities. Web Services have emerged recently to support the exchange of data in distributed environments using common Internet technologies and have been used mainly to build business-to-business applications. However, Web Services have capabilities that make them suitable to meet the requirements posed by groupware applications, a field where little work has been carried out. This article describes a model for developing cooperative applications based on Web Services technology and using asynchronous notification of events, and presents a brief description of the implementation of the support services for that model and of a prototype application that uses them.

Abstract
Desktop video editing plays an important role in the digital video market, and cooperative applications are important for organizations. Cooperative video editing tools can be an interesting solution for large broadcasters or for remote reporting, and such commercial products are lacking. This paper describes a cooperative video editing tool, Coview, which uses Web services to provide the cooperative functionalities. For this purpose, an overview is given of the basic issues of Web Services and Computer Supported Cooperative Work. Then, the Web Services-based cooperative infrastructure and the Coview prototype is described. Finally, some experimental results and concluding remarks are presented.

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