Identify a virtual machine

Guys,

Need a little help, it would be possible to identify a virtual machine (virtualbox for example) behind a code in c / c + +?
If yes someone rial any examples of how to do it?
You should also read this article, is old, but maybe it will give you some starting point:
http://www.codeproject.com/Articles/9823/Detect-if-your-program-is-running-inside-a-Virtual
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