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(emacs)Mouse References

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Following References with the Mouse
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   Some Emacs buffers display lists of various sorts.  These include
lists of files, of buffers, of possible completions, of matches for a
pattern, and so on.

   Since yanking text into these buffers is not very useful, most of
them define `Mouse-2' specially, as a command to use or view the item
you click on.

   For example, if you click `Mouse-2' on a file name in a Dired
buffer, you visit that file.  If you click `Mouse-2' on an error
message in the `*Compilation*' buffer, you go to the source code for
that error message.  If you click `Mouse-2' on a completion in the
`*Completions*' buffer, you choose that completion.

   You can usually tell when `Mouse-2' has this special sort of meaning
because the sensitive text highlights when you move the mouse over it.