static void Main()
        {
            Application.EnableVisualStyles();
            
            Application.SetCompatibleTextRenderingDefault(false);
            bool ok = false;
            System.Threading.Mutex myMutex = new System.Threading.Mutex(true, "EEM_client", out ok);
            if (!ok)
            {
                
                int handle_ = FindWindow("SomeForm", null);//не находит такое окно
                Process[] progsRunning_ = Process.GetProcessesByName("SomeApp");

                if (progsRunning_ != null && progsRunning_.Length > 0)
                {
                    Program.ShowWindow((IntPtr)handle_, 1);
                    //progsRunning_[0].MainWindowHandle, 9);//тут какой-то хэндл другого окна
                    //MessageBox.Show(progsRunning_[0].MainWindowTitle);
                }

                return;
            }
            Application.Run(new SomeForm());
            GC.KeepAlive(myMutex); 

        }