RemotingConfiguration.Configure(@"client.exe.config", false);
RemoteObject obj = new RemoteObject();

<configuration>
  <system.runtime.remoting>
    <application name ="Client">
      <client url="http://pupkin:6791/CallbackSample">
        <activated type ="Object.RemoteObject, RemoteObject"/>
      </client>
      <channels>
         <channel ref="http" port="0" />
         <serverProviders>
          <provider ref ="binary" typeFilterLevel ="Full"/>
         </serverProviders>
      </channels>
    </application>
  </system.runtime.remoting>
</configuration>

RemoteObject obj = (RemoteObject) Activator.GetObject(typeof(RemoteObject), "http://pupkin:6791/CallbackSample");