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Executable directory: The path to use when searching for executable files. Corresponds to the environment variable path.
Include directory: The path to use when searching for included files. correspond to include;
Reference directory: The path to use when searching for files introduced through #using. Correspond with environment variable LIBPATH;
Library Directory: The path to use when searching for a library file. Corresponds to the environment variable lib.

 PCH files are precompiled header-related files. Precompiled header concept: the so-called precompiled header is to put a part of the code in a project, pre-compiled and placed in a file (usually with a. pch extension), this file is called Precompiled header file, these precompiled code can be any C/s Code--------even inline functions, but must be stable and not be constantly changed during engineering development.
This makes some very stable content each time the compilation is not repeated every time the compilation. Time-saving
http://msdn.microsoft.com/zh-cn/library/3dxawkbx (v=vs.80). aspxWhat is the difference between "include directory" and "Additional Include directory"
http://blog.csdn.net/cppyin/article/details/6225596
One is to modify the value of the include macro for the system, which is global, one for the project, and no effect for other projects.

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