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This paper examines the usability of the hypertext navigation facilities provided byWorld Wide Web client applications. A notation is de ned to represent the user's navigational acts and the resultant system states. The notation is used to report potential, or `theoretical,' problems in the models of navigation supported by three web client applications. A(More)
Secreted Frizzled-related proteins (SFRPs) are modulators of the intermeshing pathways in which signals are transduced by Wnt ligands through Frizzled (Fz) membrane receptors. The Wnt networks influence biological processes ranging from developmental cell fate, cell polarity and adhesion to tumorigenesis and apoptosis. In the five or six years since their(More)
Several years of research suggest improvement is needed in how people return to their previously visited Web pages. Web page revisitation is one of the most frequent actions in computer use, so any interface improvements in this area can have a very large effect. Five categories of revisitation research are involved: 1) Characterizations of user behavior;(More)
Users’ personal information spaces are characterized by their content, organisation, and ongoing user interaction with them. They are fluid entities, evolving over time, and supporting multiple user activities that may require different perspectives of the same underlying information structure. Increasing storage capacity of computing devices and ready(More)
Listening to music on personal, digital devices whilst mobile is an enjoyable, everyday activity. We explore a scheme for exploiting this practice to immerse listeners in navigation cues. Our prototype, ONTRACK, continuously adapts audio, modifying the spatial balance and volume to lead listeners to their target destination. First we report on an initial(More)
Navigation within two-dimensional information spaces such as documents, images and spreadsheets is commonly supported by a combination of discrete scrolling, panning and zooming facilities. However, the number of navigational actions increases as the proportion of the space that is visible on a display decreases. The problem of increased navigational effort(More)