can play both client and server
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in client/server you trust the server, but not the clients
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evolve continually
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objects delegate parts of their implementation to the other objects (also dynamically composed at runtime). Because of subclassing, the implementation of an object may change over time
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interactions are not well defined
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because of encapsulation, you cannot understand all the interactions between objects
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are polymorphic (ideal for Trojan horses!)
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can scale without limit
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how do you manage the access right to millions of servers?
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are very dynamic
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