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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.

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Major mode for C, C++, Objective-C, Java, CORBA IDL, Pike, AWK. Included in GNU Emacs and XEmacs.
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a Collection of Emacs Development Environment Tools written with the end goal of creating an advanced development environment in Emacs
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Character encoding refers to the way characters are represented as a series of bytes
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a mode for interacting with Clojure. As Slime does for Common Lisp, Cider does for Clojure.
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a modern Lisp dialect for the Java Virtual Machine (with versions for the CLR and JavaScript).
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a feature of Emacs that allows one to ‘fold’ (collapse/hide) and ‘unfold’ (expand/reveal) large blocks of code.
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for font colors, menu colors, screen colors, and other presentation elements of Emacs interface. For questions about colors related to exports, printing, and external programs, include additional tags…
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is the command interpreter mode for interacting with external processes. Using the base comint-mode, Emacs provides derived modes for specific process-in-a-buffer. Common ones are shell, lisp, scheme,…
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functions that can be invoked interactively either through `M-x` or by a key binding.
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is for distinguishing comment lines from code. Emacs uses the same key bindings for manipulating comments in different modes. Emacs handles all the different ways of inserting comments for each of the…
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Editing Common Lisp code and working with inferior Common Lisp read-eval-print loops. Note that Emacs's Lisp dialect is not Common Lisp; for Emacs Lisp, use the tag [elisp].
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a text completion framework for Emacs. The name stands for "complete anything". It uses pluggable back-ends and front-ends to retrieve and display completion candidates.
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Running compilers, and more generally building software from within Emacs.
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Compilation mode turns each error message in the buffer into a hyperlink; you can move point to it and type RET, or click on it with the mouse (see Mouse References), to visit the locus of the error m…
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refers to TAB completions (or other keystroke shortcuts) to selecting the target element from a list of many. Often useful for menus, navigations, searching, jumping, folding, and other forms of "narr…