Part III. Extending Excel
These chapters teach you the advanced programming techniques used to create Excel add-ins, use external libraries, access data from the Web, use the next generation of programming tools, and secure your applications. These tasks extend Excel by building new components such as add-ins and by incorporating a wide range of existing components, from Windows DLLs to .NET assemblies. Since many of these topics are conceptual, these chapters feature more how-to and less reference than Part II.
Chapter 22, Building Add-ins
Chapter 23, Integrating DLLs and COM
Chapter 24, Getting Data from the Web
Chapter 25, Programming Excel with .NET
Chapter 26, Exploring Security in Depth
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