(MFC class library explains CHM in detail. The MFC reference covers the contents of class, global function, global variable and macro in Microsoft basic class library.
The "class hierarchy diagram" in the reference is to find the base class of a class conveniently.
This MFC reference usually does not describe functions or operators that pass through inheritance. For information about these functions, please refer to the base class information of the class in the class hierarchy diagram. The description documents of each class include: the general description of the class, the types of class members, and the basic uses of the member functions, overloaded operators, or data members.)