Platform SDK
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Platform SDK is a collection of tools supplied by Microsoft free of cost as an internet download or on CD-ROM for a nominal fee.
It includes a C/C++ compiler, a kernel mode debugger (WinDBG), and all the standard header files and libraries necessary for developing software for the Windows Operating System. It does not include any elaborate GUI tools like the Visual Studio IDE, or any object-oriented window-library like MFC. Hence it is very difficult to produce high functionality applications like GUI Office suites using just the SDK, but even relatively complex applications like text-editors can be developed using only the tools available form the SDK and the free version of the Visual C Plus Plus compiler.