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Comments in code depend on the programming language used.

* '''CommentingCode''' -- introduction/overview of using comments in Emacs


* AutoFillMode -- filling (code and) comments
* AutomaticFileHeaders -- automatic insertion and update of (comment-block) file headers
* DocMode -- create or edit foldable %%JavaDoc%% or Doxygen comment blocks
* DoxyPreview -- Preview latex formulas, graphs, images of doxygen's comments.
* ExtraLicense -- insert (comment-block) licensing text into the current buffer
* FillAdapt -- filling that guesses a fill prefix
* FillingComments -- filling for comments only, in c-mode
* HideOrIgnoreComments -- Command '''`hide/show-comments'''' to hide/show all comments or all comments in [[region]].  Lisp macro '''`with-comments-hidden'''', to do something while ignoring commented text.
* HideShow -- hide/show multi-line comment blocks
* '''<tt>[[Icicles - Search Commands, Overview#icicle-search-thing|icicle-search-thing]]</tt>'''
** Use `##C-M-;##' to toggle ignoring comments while searching code
** Use '''`comment'''' as the thing type to search only the comments
* LineCommentBanner -- one-line banner-style comments
* LiterateEmacsLisp -- literate programming with EmacsLisp
* [[rebox2]] -- [[LeWang]]’s fork of ##rebox.el## that does comment box editing and filling
* SemanticRecoder -- create or fill comments based on local context
* UncommentSexp -- comment/uncomment a [[sexp]]
* [[VimMode - Examples]] -- comment/uncomment the [[region]]
* EndOfLineNoComments -- a command to move to the end of your code, not the end of your line
* CommentEdit -- create/edit shell-like (aka end-of-line) comments in a dedicated buffer
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