Abstract.We investigate an important interaction that can take place in a ubiquitous computing environment, that of opportunistic browsing, a form of information gathering on the fly. Opportunistic browsing is characterised by being ubiquitous, unintentional and effortless. In this paper, we clarify the concept of opportunistic browsing and place it within a cognitive framework. We further discuss the nature of the interactions that can be triggered by the serendipitous discovery of information through opportunistic browsing and the importance of context-awareness, and we identify important research issues.
This paper presents work undertaken to integrate the future UK national Shibboleth infrastructure with the UK's National Grid Service (NGS). Our work, ShibGrid, provides both transparent authentication for portal based Grid access and a credential transformation service for users of other Grid access methods. The ShibGrid support for portal-based transparent Grid authentication is provided as a set of standards-based drop-in modules which can be used with any project portal as well as the NGS project in which they are initially deployed. The ShibGrid architecture requires no changes to the UK national Shibboleth authentication infrastructure or the NGS security infrastructure and provides access for users both with and without UK e-Science certificates.
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