By Jon Crowcroft, Ian Pratt (auth.), Enrico Gregori, Giuseppe Anastasi, Stefano Basagni (eds.)

This booklet provides the revised model of 7 tutorials given on the NETWORKING 2002 convention in Pisa, Italy in may well 2002.
The academics current a coherent view of the middle matters within the following areas:
- peer-to-peer computing and communications
- cellular computing middleware
- community safeguard within the multicast framework
- categorizing computing resources in line with communique patterns
- comments on ad-hoc networking
- verbal exchange via digital technologies
- optical networks.

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The event notification architecture (from [76]). The main idea of these systems is to offer the ability to change the behaviour of the middleware and application based on the knowledge on the changing context. This seems to be a valid idea given the scarce resources and the dynamicity of the mobile environment. Much research has recently been investigating context-awareness issues. Another example of context-aware systems is Odyssey [62], a data-sharing middleware with synchronisation policies depending on applications.

Mechanisms for dynamic adaptation and conflict resolutions have also been put in place [35]. In [76] another approach to context-awareness in mobile computing is presented. The paper presents a middleware for event notification to mobile computing applications. Different event channels allow differentiation of notification of different context and environmental variables. Figure 9 shows the architecture of the system. The asynchronous event channel suits the mobile computing setting allowing for disconnection; however the model the authors assume is based on permanent but fluctuating connectivity.

Even during these periods, the available bandwidth is, by orders of magnitude, lower than in fixed distributed systems, and it may also suddenly drop to zero in areas with no network coverage. It is often the case that the client asking for a service, and the server delivering that service, are not connected at the same time. In order to allow interaction between components that are not executing along the same time line, an asynchronous form of communication is necessary. For example, it might be possible for a client to ask for a service, disconnect from the network, and collect the result of the request at some point later when able to reconnect.

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