C#

public byte[] SendHardwareCommand(int command, byte[] data);
		//
		// Summary:
		//	 Sets the data format for a device and maps application-defined actions to
		//	 device objects. It also sets the buffer size for buffered data.
		//
		// Parameters:
		//   af:
		//
		//   flags:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

using Microsoft.DirectX;
using Microsoft.DirectX.DirectInput;

namespace ConsoleApplication1
{
	class Program
	{
		static void Main(string[] args)
		{
			Device keyboard;

			keyboard = new Device(SystemGuid.Keyboard);
			try
			{
				keyboard.Acquire();
			}
			catch (DirectXException ex)
			{
				Console.WriteLine(ex.Message);
			}

			KeyboardState keyboardState;

			try
			{
				keyboard.Poll();
				keyboardState = keyboard.GetCurrentKeyboardState();
			}
			catch (NotAcquiredException)
			{
				try
				{
					keyboard.Acquire();
				}
				catch (InputException iex)
				{
					Console.WriteLine(iex.Message);
				}
			}
			catch (InputException ex2)
			{
				Console.WriteLine(ex2.Message);
			}

			//--------------------------------

			Console.WriteLine("Wait 2 seconds:");
			Thread.Sleep(2000);

			// what to do with that SendHardwareCommand
			byte[] byteArray = new byte[1];
			byteArray[0] = (byte)'?';

			keyboard.SendHardwareCommand(2, byteArray);
			//
		}
	}
}