This is called autocomplete. If you go into your internet properties, click on the Content Button. You will see the autocomplete button. Click on it, and there are a few settings in there to turn on/off. I do not know of any way to adjust up/down the number of characters that it should wait for before showing options.
Hope this helps! Mudskipper
___________________________________________________________________________________
Groucho said it best- "A four year-old child could understand this! Quick! Run out and find me a four year-old child: I can't make heads nor tails out of this!"