Getting member documentation via reflection

The neat little tool at http://www.aisto.com/roeder/dotnet/ called .Net Reflector is capable of retrieving the XML code documentation from Assemblies that it processes. I can't find any members in the Reflection namespace that have anything to do with documentation. How do I retrieve the documentation of an assembly via reflection?

The XML documentation is not contained in the assembly. It's contained in the XML file that accompanies the assembly. That's why it's called XML documentation.