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Welcome to the Home of NVDANonVisual Desktop Access (NVDA) is a free and open source screen reader for the Microsoft Windows operating system. Providing feedback via synthetic speech and Braille, it enables blind or vision impaired people to access computers running Windows for no more cost than a sighted person. Major features include support for over 20 languages and the ability to run entirely from a USB drive with no installation. NVDA is developed by NV Access, with contributions from the community.About NVDAGeneral FeaturesProviding feedback via synthetic speech and Braille, NVDA allows blind and vision impaired people to access and interact with the Windows operating system and many third party applications.Major highlights include:Support for popular applications including web browsers, email clients, internet chat programs and office suitesBuilt in speech synthesizer supporting over 20 languagesannouncement of textual formatting where available such as font name and size, style and spelling errorsAutomatic announcement of text under the mouse and optional audible indication of the mouse positionSupport for many refreshable braille displaysAbility to run entirely from a USB stick or other portable media without the need for installationEasy to use talking installerTranslated into many languagesSupport for modern Windows Operating Systems including both 32 and 64 bit variantsAbility to run on Windows logon and other secure screensSupport for common accessibility interfaces such as Microsoft Active Accessibility, Java Access Bridge, IAccessible2 and UI Automationsupport for Windows Command Prompt and console applicationsInternationalizationIt is important that people anywhere in the world, no matter what language they speak, get the same access to technologies. NVDA currently has been translated into over 20 languages including: Brazilian Portuguese, Czech, Finnish, French, German, Hungarian, Italian, Portuguese, Slovak, Spanish, Swedish, Traditional Chinese, Vietnamese, Afrikaans, Galician, Croatian, Japanese, Polish, Russian, Thai and Ukrainian.Speech Synthesizer SupportApart from providing its messages and interface in several languages, NVDA can also enable the user to read content in any language, as long as they have a speech synthesizer that can speak that language.NVDA is bundled with eSpeak, a free, open-source, multi-lingual speech synthesizer. Additionally, NVDA can use both SAPI4 and SAPI5 speech engines to provide speech output.Innovation and ExperimentationNVDA is not driven by profit, nor is it constrained by a need to follow market trends and demands. This allows for the freedom to research, experiment with and implement new, innovative techniques to improve accessibility for blind and vision impaired users, as well as enabling features desirable to minorities to be given higher priority where appropriate.System RequirementsNVDA runs on both 32-bit and 64-bit editions of Microsoft Windows XP or later. NVDA has no additional hardware requirements beyond those of the operating system and requires less than 50 mb of disk space.Technical Design and ImplementationNVDA is written in the Python programming language, which allows for rapid development among other benefits. Code that needs to be injected into other processes is written in C++ for high performance. NVDA is built with an extensible, modular, object oriented, abstract design. Its code can be easily extended in order to support new applications and controls. App Modules can be written to add overall support for a specific application, virtual buffers can be written to allow NVDA to display complex documents or other data, and NVDA Objects can be written to add support for specific controls or Windows. NVDA's abstract design allows for the seemless support and integration of many different accessibility and native APIs. It is designed with a focus on accuracy, efficiency and optimisation.For a detailed overview of NVDA's technical design, see DesignOverview.Licence and CopyrightNVDA is copyright ©2006-2011 NVDA contributors.NVDA is covered by the GNU General Public License (Version 2). You are free to share or change this software in any way you like as long as it is accompanied by the license and you make all source code available to anyone who wants it. This applies to both original and modified copies of this software, plus any derivative works.
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