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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a mail reader for Emacs.
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a major mode for editing HTML templates containing parts (CSS, JavaScript) and blocks (server/client side engines)
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for questions about handling white or blank spaces. Besides space characters, Emacs is configured to handle the following as white space characters: tabs, indents, newlines that create blank space bet…
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one part of a frame, displaying one buffer. For questions about operating system windows, see the tag 'frame.
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is for splitting an Emacs window into two. Multiple windows can display different buffers, or different parts of one buffer. Emacs has several default key bindings for splitting windows.
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acronym for Windows Subsystem for Linux.
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fork of GNU Emacs, providing much of the same functionality. XEmacs development is stagnant.
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are configuration parameters for the graphical X client applications. They are usually specified in user-level configuration `dotfile`, typically located at ~/.Xresources.
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Emacs' name for 'paste' (the one that goes together with copy).
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a template system for Emacs. It allows you to type an abbreviation and automatically expand it into function templates. Bundled language templates includes: C, C++, C#, Perl, Python, Ruby…