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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 is a Lisp function.
     (multiply-by-seven NUMBER)
     
     Multiply NUMBER by seven.

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