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 for Windows 2000
From The Free On-line Dictionary of Computing (30 December 2018) :

  Windows 2000
  Windows 2K
  Windows NT 5
      (Win2k, W2k, NT5, Windows NT 5.0) An
     operating system developed by Microsoft Corporation for
     PCs and servers, as the successor to Windows NT 4.0.
     Early beta versions were referred to as "Windows NT 5.0".
     Windows 2000 was officially released on 2000-02-17.
     Windows 2000 is most commonly used on Intel x86 and
     Pentium processors, with a DEC Alpha version rumoured.
     Unlike Windows NT 4.0, Windows 2000 is not available for
     PowerPC or MIPS.
     Windows 2000's user interface is very similar to Windows
     95 or Windows NT 4.0 with integrated Internet Explorer, or
     to Windows 98.
     It is available in four flavours:
     - Professional: the client version, meant for desktop
     workstations, successor to Windows NT Workstation.
     - Server: "entry-level" server, designed for small
     deployments, and departmental file, print, or intranet
     - Advanced Server: high throughput, larger scale servers
     and applications, and small to medium scale websites.
     - Data Center Server: software for large-scale server
     clusters (in development as of 2000-03-14).
     New features in Windows 2000 include:
     - Active Directory.
     - Greatly improved built-in security mechanisms, including
     Kerberos-based authentication, public key support, an
     encrypting file system, and IPsec support.
     - Integrated web browser - Internet Explorer 5.0.
     - Integrated web server - IIS 5.0
     - Terminal services for displaying application interfaces on
     remote computers (similar to X-Windows).
     - File protection that prevents user programs from
     accidentally deleting or overwriting critical system files.
     - Improved hardware support, including Plug-and-Play, DVD,
     IEEE-1394 (FireWire), USB, infra-red, PCMCIA, ACPI,
     laptop computers.
     - Improved user interface, including a single point to control
     the entire system.
     - Improved management tools, including remote administration.
     Minimum system requirements, according to Microsoft, are
     Pentium-133 MHz CPU, 64 MB RAM, 650 MB of hard
     disk space.  These are for W2K Professional, others require
     Many operating systems compete with Windows 2000, including
     the Apple MacOS, Linux, FreeBSD, OpenBSD, NetBSD,
     Sun Solaris, IBM AIX, Hewlett-Packard HP-UX, SGI
     Irix.  Novell's NDS also provides a service similar to
     Active Directory.
     Windows 2000 will be followed by Windows XP Professional and
     Windows 2002.

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