21.9 Documentation Commands
As you edit Lisp code to be run in Emacs, you can use the commands `C-h
f' (`describe-function') and `C-h v' (`describe-variable') to print
documentation of functions and variables you want to call. These
commands use the minibuffer to read the name of a function or variable
to document, and display the documentation in a window.
For extra convenience, these commands provide default arguments
based on the code in the neighborhood of point. `C-h f' sets the
default to the function called in the innermost list containing point.
`C-h v' uses the symbol name around or adjacent to point as its default.
The `M-x manual-entry' command gives you access to documentation on
Unix commands, system calls, and libraries. The command reads a topic
as an argument, and displays the Unix manual page for that topic.
`manual-entry' always searches all 8 sections of the manual and
concatenates all the entries it finds. For example, the topic
`termcap' finds the description of the termcap library from section 3,
followed by the description of the termcap data base from section 5.
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