ILog logger_a = LogManager.GetLogger("A");
ILog logger_b = LogManager.GetLogger("B");
ILog logger_c = LogManager.GetLogger("C");

// During application initialization
IUnityContainer myContainer = new UnityContainer();
LoggingService concreteLoggingService = new LoggingService( "logID" );
myContainer.RegisterInstance<ILoggingService>( concreteLoggingService );

// This would be injected, so you wouldn't see this, but it's here for consistency
ILoggingService loggingService = myContainer.Resolve<ILoggingService>();
loggingService.LogMessage( "message" );

// During application initialization
ServiceLocator.Register<ILoggingService>( new LoggingService( "logID" ) );

// Retrieved as needed
ILoggingService loggingServce = LoggingServiceLocator.Locate<ILoggingService>();
loggingService.LogMessage( "message" );