Visual Basic 4 was provided in both 16-bit and 32-bit flavors, designed to run on the Windows version 3.1 operating system and on Windows 95 and Windows NT. Visual Basic 6, however, does not provide a version for 16-bit programming. As a result, this book focuses primarily on Visual Basic 6 programming for 32-bit Windows.
If you are developing code for Windows NT, this book will still suit your needs well. Some application programming interface (API) system-level calls will need slight adjustments, but most of the programs and examples here will work just fine under Windows NT.