title: What is _In_ in C++?
body: <p>I have searched this up rather a lot, but come up with no helpful results.</p>
  
  <p>I am currently trying to program simple DirextX game for Windows 8 Metro, and have come across <code>_In_</code> rather a lot. I'm just wondering what it is.</p>
  
  <p>Also, I have seen a lot of the use of <code>^</code> as the pointer <code>*</code> which I found odd. On top of this, some classes have an interface of <code>ref class MyClass</code>, which I believe is for C# legibility.</p>
  
  <p>Anyway, any help would be brilliant.</p>