Windows 95, Windows 3.1, or Windows 3.11 can reside on the same computer as Windows NT. Windows NT can be installed in the same folder as Windows 3.1 or Windows 3.11 because Windows NT puts all of its important files in the system32 folder. Windows NT only uses the %systemroot% folder for legacy ini files that it maintains for 16-bit application programs and backwards compatibility. So, all of the Windows 3.1 or Windows 3.11 files will be either in the %systemroot% folder or in the %systemroot%\System folder. This organization allows the two operating systems to co-exist in the same folder.
You can also install Windows NT into a different folder. Windows 3.1 or Windows 3.11 still co-exist with Windows NT, but you do not get the option to migrate ini and program manager settings from Windows 3.1 or Windows 3.11.
If you install Windows 95 and Windows NT on the same disk, you must install them in different folders.
You can also install different versions of the Windows NT operating system on your hard disk, as long as you install them on different folders. If you are going to log into a domain, each instance of Windows NT must have a different computer name, which you specify during Windows NT Setup. You should ask your network administrator for the computer name to use before running Windows NT Setup.
When you install multiple Windows operating systems on the same computer, you need to install Windows-based application programs by using each operating system. For example, if you install both Windows 95 and Windows NT 4.0, you need to install application programs when you are running Windows NT 4.0 and when you are running Windows 95. If you have more than one version of Windows NT installed, you also need to install the application programs when running each version. To install Windows-based application programs when running Windows NT 4.0, you must log on with a user ID that has administrative privileges.