Summary
External libraries, referred to as dynamic link libraries (DLLs), open up the entire Windows API as well as other function libraries to your custom applications. Using external libraries, your applications can harness the power of functions written in other languages, such as C, Delphi, or Visual Basic. In this chapter, you learned how to declare API functions, type structures, and constants, and how to call Windows API functions. Using the techniques that you learned, you can easily extend beyond the power of Access, harnessing the power of the operating system environment.