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(emacs-lisp-intro.info)Effect of installation

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The effect of installation
--------------------------

   You can see the effect of installing `multiply-by-seven' by
evaluating the following sample.  Place the cursor after the following
expression and type `C-x C-e'.  The number 21 will appear in the echo
area.

     (multiply-by-seven 3)

   If you wish, you can read the documentation for the function by
typing `C-h f' (`describe-function') and then the name of the function,
`multiply-by-seven'.  When you do this, a `*Help*' window will appear
on your screen that says:

     multiply-by-seven:
     Multiply NUMBER by seven.

(To return to a single window on your screen, type `C-x 1'.)