Word:

operating system

Noun1.operating systemoperating system - (computer science) software that controls the execution of computer programs and may provide various services
Synonyms: OS
(operating system)operating system - (OS) The low-level software which handles the interface to peripheral hardware, schedules tasks, allocates storage, and presents a default interface to the user when no application program is running.

The OS may be split into a kernel which is always present and various system programs which use facilities provided by the kernel to perform higher-level house-keeping tasks, often acting as servers in a client-server relationship.

Some would include a graphical user interface and window system as part of the OS, others would not. The operating system loader, BIOS, or other firmware required at boot time or when installing the operating system would generally not be considered part of the operating system, though this distinction is unclear in the case of a rommable operating system such as RISC OS.

The facilities an operating system provides and its general design philosophy exert an extremely strong influence on programming style and on the technical cultures that grow up around the machines on which it runs.

Example operating systems include 386BSD, AIX, AOS, Amoeba, Angel, Artemis microkernel, BeOS, Brazil, COS, CP/M, CTSS, Chorus, DACNOS, DOSEXEC 2, GCOS, GEORGE 3, GEOS, ITS, KAOS, Linux, LynxOS, MPV, MS-DOS, MVS, Mach, Macintosh operating system, Microsoft Windows, MINIX, Multics, Multipop-68, Novell NetWare, OS-9, OS/2, Pick, Plan 9, QNX, RISC OS, STING, System V, System/360, TOPS-10, TOPS-20, TRUSIX, TWENEX, TYMCOM-X, Thoth, Unix, VM/CMS, VMS, VRTX, VSTa, VxWorks, WAITS.

FAQ.

Usenet newsgroup: news:comp.os.research.
computer science, computing, disk operating system, DOS, executive program, OS, package, platform, software, software package, software system, supervisor, supervisory program, UNIX, UNIX operating system, UNIX system
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Operate
operate on
Operatic
operatic star
operating
operating budget
operating capability
operating capital
operating cost
operating expense
operating instructions
operating microscope
operating procedure
operating room
operating statement
operating surgeon
-- operating system --
Operating System/360
Operating System/Multiprogramming of Fixed Tasks
operating table
operating theater
operating theatre
Operation
operation code
Operation Desert Storm
Operation of law
operational
operational casualty
operational cell
operational damage
operational database
operational requirements
operational semantics
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