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What does the common language runtime do? The common language runtime manages the execution of code and provides services such as cross-language integration, code access security, object lifetime management, and debugging and profiling support. Search for "Common Language Runtime" in the MSDN Library ( msdn.microsoft.com/library/ ). What's the difference between managed and unmanaged code? Code developed with a language compiler that targets the common language runtime is called managed code. All code based on Microsoft intermediate language (MSIL) executes as managed code. Managed code is self-describing; it contains metadata that describes every element managed by the common language runtime. The runtime uses the metadata to provide services. Code that runs outside the runtime and does not contain metadata is called unmanaged code. Examples of unmanaged code are COM components, ActiveX interfaces, and Win32 API functions. Unmanaged code executes in the common language r...