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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

Whitespace is a language that uses only spaces, tabs, and linefeeds to control a program.
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Wikipedia is a free online encyclopedia that allows anyone to edit articles.
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WildFly, formerly known as JBoss Application Server, is an application server that implements the Java Platform, Enterprise Edition (Java EE).
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The Win32 API is the core set of application programming interfaces (APIs) available in the Microsoft Windows operating systems. This tag is for questions about developing native Windows applications …
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Microsoft's well-known operating system. Use this tag for code reviews where the code is targeted specifically for this platform, when no other more specific tags exist.
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Windows Phone is Microsoft's mobile operating system and software development platform.
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Windows Phone is Microsoft's mobile operating system and software development platform. Use this tag for questions specific to Version 7.x.
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Windows Runtime (WinRT) is a Microsoft platform architecture that allows applications to run in a sandboxed environment exposing a 'Windows Modern Style' UI/UX. Not to be confused with Windows RT, …
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WinForms is the informal term given to the graphical application programming interface (API) included as a part of Microsoft's .NET Framework, providing access to the native Microsoft Windows interfac…
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Query over the content of CIM repository on Windows Machines that uses WQL (Windows Management Instrumentation Query Language).
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Wolfram Mathematica is a computer algebra system and programming language from Wolfram Research. Mathematica has its own StackExchange site at
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Questions concerning Wordle solvers or clones.
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WordPress is a free and open source blogging tool and a content-management system (CMS) based on PHP and MySQL.
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Windows Presentation Foundation (WPF) is part of the Microsoft .NET framework used to create rich client user experiences for Windows application.
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A wrapper is an OOP technique where an object encapsulates (wraps) another object, hiding/protecting the object and controlling all access to it.
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Wren is a small, fast, class-based concurrent scripting and embeddable language
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wxPython is a Python wrapper for the cross-platform C++ GUI API wxWidgets.
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X11 is an extensible windowing system for bitmap displays. It forms the foundation of most Unix operating system GUIs.
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Code which runs on any of the x86 family of instruction set architectures. Questions should also be tagged for the source language (typically [assembly], though others are possible).
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Xamarin is a San Francisco based software company created by the engineers that created Mono, MonoTouch and Mono for Android which are cross-platform implementations of the Common Language Infrastruct…
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Extensible Application Markup Language (XAML) is an XML language used for defining user interfaces in WPF and Silverlight.
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For code that uses functions in the X protocol C-language Binding library.
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Extensible Markup Language (XML) is a structured document format that defines human- and machine-readable encoding rules.
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XNA is a free set of game development tools from Microsoft that facilitate game development for Xbox 360, Windows Phone, Zune and Windows platforms.
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The primary purpose of XPath is to address parts of an XML document. It also provides basic facilities for manipulation of strings, numbers and booleans. XPath uses a compact, non-XML syntax. XPath op…
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XQuery is a functional language designed to query and manipulate XML data. It is a superset of XPath, to which it adds features such as the creation of new nodes and more powerful FLWOR expressions. A…
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XML Schema Document (XSD) is a document written in the XML Schema language, typically containing the "xsd" XML namespace prefix and stored with the ".xsd" filename extension. It can be used to express…
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XSLT is a transformation language for XML. Its primary function is to transform XML documents into different output formats, commonly other XML, HTML or plain text.
24 questions is a free, open source, community-focused unit testing tool for the .NET Framework
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The computer program yacc is a parser generator developed by Stephen C. Johnson at AT&T for the Unix operating system.
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YAML: YAML Ain't Markup Language. YAML is a human friendly data serialization standard for all programming languages. In some cases it can also refer to YAML: Yet Another Multicolumn Layout. An open s…
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Yii is a high-performance, MVC architecture based, open source PHP framework best for developing Web 2.0 applications.
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YouTube is a video-sharing website on which users can upload, share and view videos. Use this tag for questions which may arise when developing for YouTube. This tag is NOT for support questions about…
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Zend Framework is an open source, object-oriented web application framework implemented in PHP 5 and licensed under the New BSD License.
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