The .NET Framework consists of a library of classes called the Framework Class Library (FCL) and a Common Language Runtime (CLR) that provides a managed code execution environment with features such as just-in-time compilation, type verification, garbage collection, and code access security. By offering these features, the CLR provides a development environment that improves programmer productivity and reduces common programming errors. (For an excellent description of the .NET Framework and its core architecture, see Applied Microsoft .NET Framework Programming by Jeffrey Richter.)
The CLR is implemented as a classic COM server whose code resides in a standard usermode Windows DLL. In fact, all components of the .NET Framework are implemented as standard user-mode Windows DLLs layered over unmanaged Windows API functions. (None of the .NET Framework runs in kernel mode.)
WinFX is "the new Windows API." It is the evolution of the .NET Framework that ships with Windows "Longhorn," the next major release of Windows. It will also be installable on Windows XP and Windows Server 2003. WinFX provides the foundation for the next generation of applications built for the Windows operating system.
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