Windows/DOS computers have always had all the Spanish characters resident inside them except for uppercase accented vowels, and most modern programs can create those and many others as well. Here are some ways in which you can insert these characters in your documents.

ASCII values. Perhaps the clumsiest but most universally usable method of entering a certain limited number of foreign language characters is to use what is is sometimes called “the extended IBM character set”. There are 255 characters in all, and each one has a number, called an ASCII value, associated with it. The ASCII values for the Spanish characters are:
 

To create these characters in virtually every WINDOWS/DOS program: hold down the Alt key as type of shift key, and while doing so enter the ASCII value on the numeric keypad (on the right side of the keyboard), then release the Alt key. Note: you may have to have the Num Lock key turned on for this option to work.
 

       Here are a few more useful "alt" numbers: