The DLL in this directory can be used to test different memory models. See the book for details. Use MAKEFILE to compile the DLL under the SDK. Use STACK.MAK to compile it under Visual C++. Note that if you compile under Visual C++, you will find the DLL and LIB files you need in the WinDebug directory that Visual C++ creates. Also note that if you want to recreate the project file yourself, you must set the project's type to "Dynamic link library" and include the DEF file in the project.