X 500 - définition. Qu'est-ce que X 500
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Qu'est-ce (qui) est X 500 - définition

SERIES OF COMPUTER NETWORKING STANDARDS COVERING ELECTRONIC DIRECTORY SERVICES
X.500 Directory; ISO/IEC 9594; CCITT X.500

X.500         
<standard, networking> The set of ITU-T standards covering electronic directory services such as white pages, Knowbot, whois. Compare: LDAP. (1994-12-06)
Winston Western 500         
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DEFUNCT AUTO RACE FORMERLY HELD IN RIVERSIDE, UNITED STATES
Motor Trend 500; Crown America 500; Riverside 500; List of Winston Western 500 broadcasters
The Winston Western 500 was an annual NASCAR Winston Cup race held at Riverside International Raceway in Riverside, California, United States, in January, and then in later years, November. From 1963 to 1981, the race was held in January and was the season opening race.
Quaker State 400 (Atlanta)         
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AUTO RACE HELD IN ATLANTA, UNITED STATES
MBNA America 500; Cracker Barrel Old Country Store 500; Cracker Barrel 500; Motorcraft Quality Parts 500; Motorcraft 500; Golden Corral 500; List of Kobalt Tools 500 broadcasters; Coca-Cola 500 (Atlanta); Purolator 500 (Atlanta); Primestar 500 (Atlanta); MBNA Bass Pro Shops 500; Atlanta 500; Atlanta 400
The Quaker State 400 presented by Walmart is a NASCAR Cup Series stock car race that was run annually each March at Atlanta Motor Speedway in Hampton, Georgia from 1960 to 2010 and as a July race since 2021. The race was the first of two races held at the Atlanta track every season, with the Dixie 500, being the second and run at various times (originally November, later October and currently the second race of the season), now run as the Folds of Honor QuikTrip 500.

Wikipédia

X.500

X.500 is a series of computer networking standards covering electronic directory services. The X.500 series was developed by the Telecommunication Standardization Sector of the International Telecommunication Union (ITU-T). ITU-T was formerly known as the Consultative Committee for International Telephony and Telegraphy (CCITT). X.500 was first approved in 1988. The directory services were developed to support requirements of X.400 electronic mail exchange and name lookup. The International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC) were partners in developing the standards, incorporating them into the Open Systems Interconnection suite of protocols. ISO/IEC 9594 is the corresponding ISO/IEC identification.