What the difference between the request-response pattern and the duplex pattern?

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Because of virus in windows 7 my general folders are system hidden now. i've remove the virus but folders are still hidden. can i make that system hidden folder as nornal any how?

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Can a microsoft office product key be used twice?

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In excel,how to clear the values of the cell without removing the formula?

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what is an Abstract class n when u use Abstract classes

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What is Root ?

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What does microsoft blend do?

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Are the addresses, the bindings, the contracts unique between services?

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What is SMTP (Simple Mail Transfer Protocol) ?

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What are the microsoft apps?

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What microsoft means?

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Who is supporting xaml? : xaml

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