Based on gtags.el included in `global'.
Here is a screenshot:
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gtags-find-any, gtags-find-any-reference
Based on context under point, find a file, a function or a symbol.
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integration with tramp
If you visit a file using tramp, gtags will work out of box. (of course, on the remote server, global has to be installed, tags have to be generated beforehand)
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syntax highlight for the results (see above screenshot)