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This subsystem is a part of .NET Framework 3.0. The Windows Communication Foundation (or WCF), previously known as Indigo, is a runtime and a set of APIs in the .NET Framework for building connected, service-oriented applications.
Windows services are a self-hosting environment for WCF services, thus you write the same code as with console and Windows hosts to initialize the ServiceHost. The main difference for Windows services is in the location where initialization and cleanup take place.