0, Many applications, including Microsoft Windows, provide functionality through DLLs.
10, By calling DLLs from your Visual Basic application, you can access this functionality.
17, In this chapter you will learn to declare and call a DLL procedure in Visual Basic; map C language data types to Visual Basic data types; pass a null value to a DLL procedure; differentiate between passing an argument by value or by reference; use the API text viewer to obtain the correct Windows API declarations; and use callback procedures.
