We often talk about the loaded assemblies list over here. This is the list of assemblies currently loaded in the app domain. Big surprise. There isn't anything incredible special about this list. It is pretty easy to access and use. At the minimum, you can print out the list of assemblies. Beyond that, you can load and instantiate any of the types within those assemblies. That's where reflection comes in.

Here's some code that prints out the list of loaded assemblies:

using System;
using System.Reflection;

namespace GetLoadedAssemblies
{
    class Program
    {
        static void Main(string[] args)
        {
            Assembly[] asms;

            asms = AppDomain.CurrentDomain.GetAssemblies();

            Console.WriteLine("There are {0} assemblies loaded:", asms.Length);
            foreach (Assembly asm in asms)
            {
                Console.WriteLine(asm.FullName);
            }

            Console.WriteLine();
            Console.WriteLine("The currently executing assembly is:");
            Console.WriteLine(Assembly.GetExecutingAssembly().FullName);

        }
    }
}