Challenge-Response System

Technology / Email / Challenge-Response System: An anti-spam program that requires a human being on the sender's end to respond to an emailed challenge message before their messages can be delivered to recipients. Senders who answer the challenge successfully are added to an authorization list. Bulk emailers can work with challenge-response if they designate an employee to watch the sending address' mailbox and to reply to each challenge by hand.

Other Words for System

System Adjective Synonyms: organized whole, organization, set, group, combination, structure, arrangement, pattern, set-up
System Noun Synonyms: scheme, method, approach, modus operandi, way, procedure, methodology, technique, plan, process, practice, routine
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North American Industry Classification System (NAICS)

Business / Agriculture / North American Industry Classification System (NAICS): Standard industrial classification codes have been replaced in the 1997 Census of Agriculture by the new North American Industry Classification System (NAICS). NAICS is a unique, all-new system for cl MORE

Nonsystematic Risk

Business / Finance / Nonsystematic Risk: Nonmarket or firm-specific risk factors that can be eliminated by diversification. Also called unique risk or diversifiable risk. Systematic risk refers to risk factors common to the entire economy. MORE

NT File System (NTFS)

Technology / Computers / NT File System (NTFS): One of the file system for the Windows NT operating system (Windows NT also supports the FAT file system). NTFS has features to improve reliability, such as transaction logs to help recover from disk MORE

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