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Emacs Lisp Documentation Lookup
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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.