Window Tabifier

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Threading;

namespace WindowTabifier
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Mutex mt = null;

            try
            {
                mt = Mutex.OpenExisting("Window Tabifier");
            }
            catch (WaitHandleCannotBeOpenedException)
            {

            }

            if (mt == null)
            {
                mt = new Mutex(true, "Window Tabifier");
                Application.Run(new Main());
                GC.KeepAlive(mt);
                mt.ReleaseMutex();
            }
            else
            {
                mt.Close();
                MessageBox.Show("Application already running");
                Application.Exit();
            }
        }
    }
}