A family of Microsoft word processing software products for creating web, email, and print documents.
You can insert them through the Symbol dialog (Insert | Symbols | Symbol | More Symbols...), but note that there are built-in keyboard shortcuts for all the accented letters you would need for Spanish or Portuguese. For a chart of these, see the section on "International characters" at http://wordfaqs.ssbarnhill.com/InsertSpecChars.htm. Note that in this chart, a combination such as "Ctrl+' (apostrophe), the letter" means that you press the Ctrl key and the apostrophe key simultaneously, release, and then type the desired letter.