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For other uses, see CVI (disambiguation).
Developer(s) National Instruments
Stable release 2015 / August 2015
Operating system Windows 8/Windows 7/Vista/XP with Linux Run-Time support and Pharlap Real-Time Run-Time support
Type Data Acquisition, Instrument Control, Test Automation, Analysis and Signal Processing

LabWindows/CVI (CVI is short for C for Virtual Instrumentation) is an ANSI C programming environment for test and measurement developed by National Instruments. The program was originally released as LabWindows for DOS in 1987, but was soon revisioned (and renamed) for the Microsoft Windows platform. The current version of LabWindows/CVI (commonly referred to as CVI) is 2015.

LabWindows/CVI uses the same libraries and data acquisition modules as the better known National Instrument product LabVIEW, and is thus highly compatible with it. LabVIEW is targeted more at domain experts and scientists and CVI more towards software engineers that are more comfortable with text-based linear languages such as C.

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