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Various modes documented elsewhere have hypertext features so that you can follow links, usually by clicking Mouse-2 on the link or typing <RET> while point is on the link. Clicking Mouse-1 quickly on the link also follows it. (Hold Mouse-1 for longer if you want to set point instead.)
Info mode, Help mode and the Dired-like modes are examples of modes that have links in the buffer. The Tags facility links between uses and definitions in source files, see Tags. Imenu provides navigation amongst items indexed in the current buffer, see Imenu. Info-lookup provides mode-specific lookup of definitions in Info indexes, see Documentation. Speedbar maintains a frame in which links to files, and locations in files are displayed, see Speedbar.
Other non-mode-specific facilities described in this section enable following links from the current buffer in a context-sensitive fashion.