namespace OutOfProcCom
{
    [ComVisible(true), Guid("694C1821-14B6-4998-928F-FD858B95C835")]
    public interface IOutCom
    {
        void Message();
    }
    [GuidAttribute("682E2D3C-FF7B-4833-8DDF-6CF25389E729"), ComVisible(true), ClassInterface(ClassInterfaceType.AutoDual)]
    public class OutCom : IOutCom
    {
        public void Message()
        {
            MessageBox.Show("Message");
        }

        [MTAThread]
        static void Main(string[] args)
        {
            var regServices = new RegistrationServices();
            var a = regServices.RegisterTypeForComClients(typeof(OutCom),RegistrationClassContext.LocalServer | RegistrationClassContext.RemoteServer,RegistrationConnectionType.MultipleUse);
            Console.WriteLine("Server registered, press any key to exit");
            Console.ReadKey();
            regServices.UnregisterTypeForComClients(a);
        }
    }
}

set obj=CreateObject("OutOfProcCom.OutCom")
obj.Message