An important concern is that posting personal information on social websites such as Facebook, MySpace and Bebo is putting children at risk of abuse. Our survey of children at Key Stages 3 and 4 shows that a substantial minority (42%) of children regularly interact socially online with people they have not met face to face. This does not, of itself, indicate that children are naive or engaging in behaviour that puts them at significant risk. Rather, it shows that online interaction forms a different, though overlapping, social space to that of face-to-face friendships, involving friends of friends and people encountered in the online world, for example, through multiplayer games.
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Concurrent programming is still challenging and difficult. “Since concurrency techniques have become indispensable for programmers who create highly available services and reactive applications, temporal dimensions of correctness introduced by concurrency, i.e., safety and liveness, are central concerns in any concurrent design and its implementation” [Lea 98]. And without expert guidance and concurrent design-pattern description, they’re expected to occasionally fail. Thus providing significant examples and paradigms for teaching good and correct style is of prime importance.

Learning concurrency paradigms is necessary but it is not sufficient. The choice of the run-time semantics must be known since it may introduce subtle design and programming errors. It is the aim of this paper to exemplify the importance of process queuing and awaking policies (whether processes are named threads or tasks) resulting from possible choices of the monitor concept implementation.
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Getting Service With the original purchase of an IBM hardware product, you have access to extensive support under warranty. Be sure to retain your proof of purchase to obtain warranty service. For hardware product assistance covered under the terms of the IBM Statement of Limited Warranty, you may call the IBM Personal Com- puter HelpCenter (1-800-772-2227 in the U.S.) The following services are available during the warranty period: Problem determination:Trained personnel are available to assist you in determining whether you have a hardware problem and deciding what action is necessary to fix the problem.
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