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+Okay, let's start with the Android Operating System. The Android

+

+2

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+system, heavily based on the generation and handling of events,

+

+3

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+so it is mostly an event driven system. However, it

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+4

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+also has some elements of publish, subscribe, in the way

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+5

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+elements in the system can register for elements of interest.

+

+6

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+So we can mark both styles here. So what about

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+7

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+Skype? We haven't discussed Skype yet. So here we probably

+

+8

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+had to take a little bit of a wild guess.

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+9

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+But as we will see in more detail in the

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+10

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+rest of the lesson. Skype is mainly a peer to

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+11

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+peer architecture, with some minimal elements of a client server

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+12

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+architecture. For example, when you start Skype and sign in

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+to a conceptually centralized server. So let's move to the

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+World Wide Web. As we just discussed, the Word Wide

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+Web is based on a rest architecture. And because rest

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+style, is a hybrid derived from other architectural styles, including the

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+client server architectural styles. Both of those styles apply here.

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+And finally Dropbox is by and large, a client server

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+architecture. As conceptually, we upload our documents to a Dropbox

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+central server, and get the files from the same server.