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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 view documentation of functions and
variables that you want to use. These commands use the minibuffer to
read the name of a function or variable to document, and display the
documentation in a window. Their default arguments are based on the
code in the neighborhood of point. For C-h f, the default is
the function called in the innermost list containing point. C-h
v uses the symbol name around or adjacent to point as its default.
A more automatic but less powerful method is Eldoc mode. This minor mode constantly displays in the echo area the argument list for the function being called at point. (In other words, it finds the function call that point is contained in, and displays the argument list of that function.) Eldoc mode applies in Emacs Lisp and Lisp Interaction modes only. Use the command M-x eldoc-mode to enable or disable this feature.