很好的学习DLL的入门例子，里面讲述了non-mfc,mfc，mfc-ext等相关dll的编写以及调研例子程序

this utility updates applications in VC++ 2008 yp the latest manifest. in this way the application can use the CRT/MFC dlls files without installation of runtime (the dll files must be in directories named Microsoft.VC90.CRT Microsoft.VC90.MFC)

用MFC调用DLL的一个小程序，实现了数字加法及字符串逆序的功能，适合初学者学习。-A small program that calls the DLL with MFC digital adder and string in reverse order of functions, suitable for beginners to learn.