** The Hahn – Banach theorem in functional analysis, allowing the extension of linear functionals

** The rotor drive train in helicopters uses a freewheeling clutch to disengage the rotors from the engine in the event of engine failure, allowing the craft to safely descend by autorotation.

** Internet hosting service, a service that runs Internet servers allowing organizations and individuals to serve content to the Internet

** Virtual host, allowing several DNS names to share the same IP address

** Panzer General, SSI ( 1994 ), video game ; strategic simulation game: Sea Lion ' 40 and Sea Lion Plus ( the latter with prestige points used to take over Gibraltar allowing Italian naval assistance ) scenarios are available given major victories in early operations, or the Sea Lion ' 43 after initial delays and later major victories in North Africa or Russia.

** Salt, allowing a horse to catch the nagana disease, so that after recovery the horse can be used in infected areas

** password: a method for straightforward password authentication, including a facility allowing a password to be changed.

** A non maskable interrupt ( NMI ) which can be used to respond to power down situations and / or other high priority events ( and allowing a minimalistic Z80 system to easily implement a two-level interrupt scheme in mode 1 ).

** President Franklin D. Roosevelt signs executive order 9066 allowing the United States military to define areas as exclusionary zones.

** A German Lorenz cipher machine operator sends a 4, 000-character message twice, allowing British mathematician Bill Tutte to decipher the machine's coding mechanism.

** Alabama Governor George C. Wallace stands in the door of the University of Alabama to protest against integration, before stepping aside and allowing African Americans James Hood and Vivian Malone to enroll.

** The Yugoslavian government begins allowing foreign companies to take their profits from the country.

** The U. S. Congress passes the Gold Coinage Act allowing the minting of gold coins.

** Richard II cancels the legal documents allowing the exiled Henry Bolingbroke to inherit his father's land.

** In the Netherlands, a fringing barrier between the North Sea and a shallow lake collapses, causing the fifth largest flood in recorded history which creates the Zuider Zee inlet and kills over 50, 000 people ; it also gives sea access to Amsterdam, allowing its development as an important port city.

** The Labour Party passed the Sex Discrimination ( Election Candidates ) Act 2002, allowing them to use all-women shortlists to select more women as election candidates.

** The first television receivers had controls allowing users to adjust the picture's vertical or horizontal linearity.

** the Yomega Brain is a centrifugal clutch transaxle -- when spinning at a sufficiently high speed, counterweights inside the yo-yo body disengage the axle, automatically allowing the yo-yo to " sleep.

** Remote Job Entry allowing the BOS system to submit jobs to a remote System / 360 and receive output.

** wet gloves ; made of neoprene and allowing water entry

** finger tip conductivity ; where conductive yarns or a conductive patch is found only on the tips of the fingers ( typically the index finger and thumb ) thus allowing for basic touch response

** full hand conductivity ; where the entire gloves is made from conductive materials allowing for robust tactile touch and dexterity good for accurate typing and multi-touch response

** Capable of producing deeper blacks allowing for superior contrast ratio

** Compressed gas can be stored, allowing the use of machines when electrical power is lost.

** Big Dipper ( Geauga Lake ), a wooden roller coaster currently Standing but not operating at Geauga Lake

** Big Dipper ( Luna Park Sydney ), a wooden roller coaster operating at Luna Park Sydney from 1935 until 1981

** The Linux kernel, used on many Linux-based operating systems

** XNU, from the Mac OS X operating systems

** Republic Airlines ( 1979-1986 ), a defunct airline purchased by Northwest Airlines that ceased operating in 1986

** Boot record, record used to start an operating system

** Four of 5 railroad operating unions strike against the Illinois Central Railroad without warning, bringing to a head a 5-year dispute over railroad work rules.

** Disneyland Monorail System, the first daily operating monorail system in the Western Hemisphere, opens to the public in Anaheim, California.

** Student Linus Torvalds posts messages to Usenet newsgroup comp. os. minix about the new operating system kernel he has been developing.

** Palm OS, an initial operating system of such PDAs ( Succeeded by WebOS.

** Continuously operating spark gaps such as arc welders

** MikroTik RouterOS ™ ( is a router operating system and software which turns a regular Intel PC or MikroTik RouterBOARD ™ hardware into a dedicated router.

** DATE ( command ), command on DOS, OS / 2 and Microsoft Windows operating systems for displaying the current date

** Forté Agent, email and Usenet news client used on the Windows operating system

** WQXGA ( 2, 560 × 1, 600 ) @ 60 Hz with CVT-RB blanking ( 269 MHz ) ( This is for high end monitors when operating at greater than 24 bits per pixel.

** Wintel, that is, Intel x86 or compatible personal computer hardware with Windows operating system

** SPARC architecture computers running Solaris operating systems

** SCO OpenServer ( formerly SCO Unix ), an operating system made by the above companies

** Great Western Trains, a train operating company from 1996 to 1998

** List of DOS operating systems, multiple OSes for both IBM and other systems

** Veolia Transport Veluwe, operating in " De Veluwe " region in Gelderland,

** Veolia Transport Brabant, operating in middle and western Noord-Brabant with 4 urban networks in Breda, Tilburg, Bergen op Zoom and Roosendaal,

** Veolia Transport Limburg, operating in the whole province of Limburg, including city buses in Maastricht, Parkstad ( Heerlen-Kerkrade-Landgraaf-Brunssum ), Venlo, and Roermond and the Roermond – Nijmegen and Maastricht – Kerkrade train routes.

** operating the International School for Holocaust Studies ;