Type a character in this field, while it is highlighted, and the first occurence of the street name will pop into the window. Continue to hit (or hold down) the same character and the next sequential name will appear. You can scroll through every occurence of names beginning with that character by continuing to type that character.
For instance, highlight the Street Name/Type field and type the letter 'F'. The entry FAIRMONT ST will pop into the box. Type 'F' again and the entry changes to FAWN DR . Typing an 'F' a third time displays FLORIDA AVE . Once you reach the end of the names that begin with an 'F' it will wrap around and display FAIRMONT ST again.