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What is the difference between Cloud, Grid and Cluster? [closed]

What is the difference between Cloud, Cluster and Grid? Please give some examples of each as the definition of cloud is very broad. As answered in another question , can I call Dropbox, Gmail, Facebook, Youtube, Rapidshare etc. a Cloud? ...
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Abusing the algebra of algebraic data types - why does this work?

The 'algebraic' expression for algebraic data types looks very suggestive to someone with a background in mathematics. Let me try to explain what I mean. ...
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How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]

I understand the basics of how ports work. However, what I don't get is how multiple clients can simultaneously connect to say port 80. I know each client has a unique (for their machine) port. Does the server reply back from an available port to the client, and simply state the reply came from 80? ...
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What is the difference between a reference type and value type in c#?

Some guy asked me this question couple of months ago and I couldn't explain it in detail. What is the difference between a reference type and a value type in C#? ...
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Why don't structs support inheritance?

I know that structs in .NET do not support inheritance, but its not exactly clear why they are limited in this way. 10 An...
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How to write :hover condition for a:before and a:after?

How to write :hover and :visited condition for a:before ? 7 Answers 7 ...
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Why does string::compare return an int?

Why does string::compare return an int instead of a smaller type like short or char ? My understanding is that this method only returns -1, 0 or 1. ...
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Replace all elements of Python NumPy Array that are greater than some value

I have a 2D NumPy array and would like to replace all values in it greater than or equal to a threshold T with 255.0. To my knowledge, the most fundamental way would be: ...
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What is the best Distributed Brute Force countermeasure?

First, a little background: It is no secret that I am implementing an auth+auth system for CodeIgniter, and so far I'm winning (so to speak). But I've run into a pretty non-trivial challenge (one that most auth libraries miss entirely, but I insist on handling it properly): how to deal intelligently...
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Convert a list of characters into a string

If I have a list of chars: 9 Answers 9 ...