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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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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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an Emacs presentation feature that alters the appearance of a buffer’s text on the screen, without changing the buffer content
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GNU Project Debugger - Start it via `M-x gdb` to run the debugger on Ada, C, C++, Objective-C, Pascal, Fortran, Java and other languages.
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Starting Emacs in daemon mode
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Calculator mode: Calculator major mode.
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The generic concept of automatically saving information to the disk or to a remote server, triggered by a timer or any other event inside of Emacs.
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Question about making, using, and editing tables inside of Emacs.
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for line numbering modes, such as `linum-mode` and `line-number-mode` minor modes that show line numbers on the left screen edge for ease of editing and navigating. They do not insert line numbers in …
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a built-in package that provides a web browser into Emacs.
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An improved JavaScript mode for GNU Emacs that emulates many desirable features of IDEs.