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Top 20 Directory:
Top : Computers : Software : Operating_Systems
  		• BIOS
  		• Boot Managers
  		• Directories
  		• File Systems
  		• Graphic Subsystems
  		• Guides
  		• History
  		• Programming@
  		• Ada@
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  		• Distributed@
  		• DOS@
  		• Education
  		• Embedded
  		• Extensible
  		• Handheld
  		• IBM@
  		• Java@
  		• Language-based@
  		• Lisp@
  		• Mainframe
  		• Microkernel
  		• Midrange
  		• Monolithic
  		• Network
  		• Oberon@
  		• Object-Oriented
  		• Open Source
  		• Parallel
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  		• POSIX
  		• Quality of Service@
  		• Realtime
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  		• Smalltalk@
  		• Submicrokernel
  		• TRON@
  		• Unix
  		• x86
  		• 2K@
  		• A-UX@
  		• AIX@
  		• Amiga@
  		• Amoeba@
  		• Amstrad@
  		• Apple II@
  		• Archy@
  		• AtheOS@
  		• BeOS@
  		• BSD-OS@
  		• Choices@
  		• CPM
  		• Darwin@
  		• Data General@
  		• Tru64@
  		• DR-DOS@
  		• eCos@
  		• EPOC@
  		• EROS@
  		• FreeBSD@
  		• FreeDOS@
  		• GEOS@
  		• GNU Hurd@
  		• HP-UX@
  		• Inferno@
  		• IRIX@
  		• L4@
  		• Linux
  		• Mach@
  		• Mac OS
  		• Microsoft Windows
  		• MINIX@
  		• ML@
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  		• NetWare@
  		• NeXT@
  		• Nucleus@
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  		• OS-2
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  		• OS-9@
  		• Palm OS@
  		• Pick@
  		• Plan 9@
  		• PURE@
  		• QNX@
  		• REAL-32@
  		• REBOL-IOS@
  		• RISC OS@
  		• RTEMS@
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  		• SCO@
  		• Self@
  		• Solaris@
  		• Squeak@
  		• THEOS
  		• ThreadX@
  		• TI-99 4A
  		• TinyOS@
  		• TUNES@
  		• V2 OS@
  		• VMS@
  		• VSE@
  		• VSTa@
  		• VxWorks@
  		• z-OS@
  		• z-VM@
    See Also:
    Sites:
  		• Convergence International: The non-Wintel user group, supporting Acorn, Amiga, Apple, ARM, Be, NCs, PowerPC, Psion, Unix and other alternative operating systems. Services include a non-Wintel news summary.
  		• How Stuff Works: Operating Systems: Unbiased enlightening tutorial with impartial description of how OSs work, and many related links.
  		• Internet Operating System Counter: Statistics on Internet OS use, WWW, FTP, and News servers. Over 940,000 hosts checked in this 1999 survey.
  		• Operating System Sucks-Rules-O-Meter: The web-based operating system quality and approval metric.
  		• OSNews: Exploring the Future of Computing: Weblog style online magazine on operating systems and computing environments. Daily updates, reader forum with many comments.
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