A. Microsoft named previous versions of Windows after the kernel version (e.g., the Windows NT 4.0 kernel version is 4.0). With Windows 2000, Microsoft changed the naming scheme so that the OS name no longer matches the kernel version but maintained the numbering order for the kernel version (e.g., the Win2K kernel version is 5.0).
Because XP included only minor core changes, its kernel version is 5.1. Win.NET Server takes this numbering scheme one step further with a kernel version of 5.2. To determine the kernel version, use a registry editor (e.g., regedit.exe) to view the CurrentVersion registry value at the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\CurrentVersion subkey.