Program.cs

using System;
using System.Threading;
using System.Windows.Forms;

namespace acer_rgb
{
    static class Program
    {
        public const string appName = "acer_x35_rgb";
        private static Mutex mutex = null;

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            bool createdNew;

            mutex = new Mutex(true, appName, out createdNew);

            if (!createdNew)
            {
                //app is already running! Exiting the application  
                return;
            }

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new frmMain(args));
        }
    }
}