1. It comes with a database of more than 35,000 words.

2. It scans your address book and grabs the names you're likely to type.

3. It knows likely letter sequences that appear in the English language. For example, if you hit the WQ key, it assumes at first that you want W. But when you follow that with a U, it changes the W to a Q.

4. Whenever you type a word or a name not in its dictionary, it adds the word as soon as you press the space key.

5. And finally, SureType scans incoming e-mail for new words to add.