Inverse search (also called "reverse search")[1] is a feature of some non-interactive typesetting programs, such as LaTeX and GNU LilyPond.
These programs read an abstract, textual, definition of a document as input, and convert this into a graphical format such as DVI or PDF.
Inverse search means that a graphical object in the output window works as a hyperlink, which brings you back to the line and column in the editor, where the clicked object was defined.
The inverse search feature is particularly useful during proofreading.
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