title: Finding references in Visual Studio
body: <p>I'm using Visual Studio and COM with C# for the first time and there's something I don't quite understand about the 'references'. How do you know what to reference with a given 'using something.something'? The .Net references seem fairly simple, but COM is less obvious. I'm running Visual Studio 2005 and have the latest VSTO installed, but for the life of me, I can't figure out what I need to reference to satisfy:</p>
  
  <p>using Microsoft.VisualStudio.Tools.Applications.Runtime;</p>
  
  <p>There are a few Microsoft.VisualStudio things in the .Net tab, but none that continue with .Tools or anything like it. I feel like I'm missing a key concept here.</p>