This question was closed by casperOne as not constructive. I don't see why. Parenthetically I also don't see the five votes required to close a question. The stated criteria for being 'constructive' are that the question should get answers that are factual and supported by references and expertise. Well, check to all three, as far as I can see.
Since classification of the question as 'not constructive' is not obvious, it would be helpful if the closer would explain the reasoning, either here or on the question itself.