They used the Forms toolbar to create fill-in areas.  Then they
protected the document.  There is a series of tutorials which should
help get you started.

Go to this page - about half way down, look for the series called
"Please Fill Out This Form"
http://www.mousetrax.com/TechPage.html#autoforms - pay particular
attention to Parts 1 through 4.  You can skip 5 until you decide you
want to take the answers and populate a database.

Have Fun!

Hi Dan,

Which version?
One possibility that works in older versions is a protected form. I guess
that is what you have seen.
You insert some text form fields, and then protect the document (or the
section) for forms.
For some tutorials, see Charles Kenyon's list:
http://www.addbalance.com/word/wordwebresources.htm#Forms
There's lots of stuff you can do with forms, such as restricting or
validating input, setting the tab order, ...

In 2003, you can (multiple) select the areas that can be edited, using the
Ctrl key.
Then you can protect the rest against editing changes from the "Protect
Document" task pane.
That's simpler, but not so powerful.

Regards,
Klaus