Which Windows in c programming language

To a common user the differences amongst various versions of Windows like Windows 95,98, ME, NT, 2000, XP, Server 2003 is limited to only visual appearances—things like color of the title bar, shape of the buttons, desktop, task bar, programs menu etc. But the truth is much farther than that. Architecturally there are huge differences amongst them. So many are the differences that Microsoft categorizes the different versions under two major heads—Consumer Windows and Windows NT Family. Windows

95, 98, ME fall under the Consumer Windows, whereas Windows NT, 2000, XP, Server 2003 fall under the Windows NT Family. Consumer Windows was targeted towards the home or small office users, whereas NT family was targeted towards business users. Microsoft no longer provides support for Consumer Windows. Hence in this book we would concentrate only on NT Family Windows. So in the rest of this book whenever I refer to Windows I mean Windows NT family, unless explicitly specified.
Before we start writing C programs under Windows let us first see some of the changes that have happened under Windows environment.