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We're not going to be able to study indepth

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any of the architectural styles that we just discussed. However, I

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want to at least discuss two representative examples of P2P

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architectures. Because, these are systems that you probably used, or at

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least, you used one of them. And, they will allow

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me to highlight some interesting points. So, as we just mentioned,

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P2P systems are decentralized resource sharing and discovery systems. And the

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two systems that I want to discuss, and that are representative

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of this kind of architectures, are Napster and Skype. And you may or

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may not be familiar with Napster, but I'm pretty sure that you know Skype.