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You can view the help of a lisp function with C-h f, then hit enter on the underlined file name.

Any way to do this with a customized keystroke?

2 Answers 2

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(global-set-key "\C-h\C-f" 'find-function-at-point)
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    If you know the name and want to save a step, you could use find-function-other-window or find-function-other-frame or find-function.
    – lawlist
    Jan 2, 2014 at 0:44
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Here are two ways. The first was suggested by @lawlist in a comment, above. Wrt the second: this is why Emacs tags were invented: to go immediately to a function definition.

  1. find-function -- bind it to any key you like. I bind it to C-x F (i.e., C-x S-f).

  2. M-. (command find-tag), after building a TAG file -- see (elisp) Tags.

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