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غیر فعال کردن دکمه های ترکیبی Alt+Tab

این کد رو یکی از دوستان توی انجمن (forum.w3-farsi.com) گذاشتن. خالی از لطف ندیدم که توی سایت هم قرار بدم:

using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication86
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public delegate IntPtr LowLevelKeyboardProcDelegate(int nCode, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam);

        [DllImport("kernel32", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);

        [DllImport("user32", EntryPoint = "SetWindowsHookEx", SetLastError = true)]
        public static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProcDelegate lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32", EntryPoint  = "UnhookWindowsHookEx", SetLastError = true)]
        public static extern bool UnhookWindowsHookEx(IntPtr hHook);

        [DllImport("user32", EntryPoint  = "CallNextHookEx", SetLastError = true)]
        public static extern IntPtr CallNextHookEx(IntPtr hHook, int nCode, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam);

        public const int WH_KEYBOARD_LL = 13;

        /*code needed to disable start menu*/
        [DllImport("user32.dll")]
        private static extern int FindWindow(string className, string windowText);
        [DllImport("user32.dll")]
        private static extern int ShowWindow(int hwnd, int command);

        private const int SW_HIDE = 0;
        private const int SW_SHOW = 1;

        public struct KBDLLHOOKSTRUCT
        {
            public int vkCode;
            public int scanCode;
            public int flags;
            public int time;
            public int dwExtraInfo;
        }

        public static IntPtr intLLKey;

        public IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam)
        {
            bool blnEat = false;

            try
            {
                switch (wParam.ToInt64())
                {
                    case 256:
                    case 257:
                    case 260:
                    case 261:

                        //Alt+Tab, Alt+Esc, Ctrl+Esc, Windows Key,
                        blnEat = ((lParam.vkCode == 9) && (lParam.flags == 32)) // alt+tab
                        || ((lParam.vkCode == 27) && (lParam.flags == 32)) // alt+esc
                        || ((lParam.vkCode == 27) && (lParam.flags == 0)) // ctrl+esc
                        || ((lParam.vkCode == 91) && (lParam.flags == 1)) // left winkey
                        || ((lParam.vkCode == 92) && (lParam.flags == 1))
                        || ((lParam.vkCode == 73) && (lParam.flags == 0));

                        break;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            if (blnEat == true)
            {
                return (IntPtr)1;
            }
            else
            {
                return CallNextHookEx(intLLKey, nCode, wParam, ref lParam);
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            using (ProcessModule curModule = Process.GetCurrentProcess().MainModule)
            {
                intLLKey = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, GetModuleHandle(curModule.ModuleName), 0);
            }
            if (intLLKey.ToInt64() == 0)
            {
                throw new Win32Exception();
            }
        }
    }
}