Active Template Library (ATL) is a set of small class, efficient, and flexible made by Microsoft that facilitate the creation of interoperable components for developing Windows applications. At the same time there are many examples in which ATL is still a superior choice for new applications -. Applications that must run fast and efficiently on Windows, where the CPU does not have memory or bandwidth to run NET. As one reviewer of technology says, "Any programmer needs to code transition NET ATL will. Requires this book." While ATL is no longer the cutting edge of Microsoft's developer tools, there should be a strong market for authoritative, comprehensive coverage, the latest version of this tool standard.