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When typing in an internet url in Internet Explorer, then it can provide listing of url's for Web addresses that matches the beginning letters.

One can configure whether it should show the drop down list of matching urls:

[HKEY_CURRENT_USER \Software \Microsoft \Windows \CurrentVersion \Explorer \AutoComplete]
AutoSuggest = "No" / "Yes"

One can configure whether to take the closest match and put it in the address bar while typing:

1. Open Control Panel
2. Double click Internet Options
3. Select Advanced tab
4. Tick/Untick Use inline AutoComplete
5. It should be reflected with this registry key:

   [HKEY_CURRENT_USER \Software \Microsoft \Windows \CurrentVersion \Explorer \AutoComplete]
   Append Completion = "No" / "Yes"

One can clear the auto complete dropdown list (Index.dat file in the History folder):

1. Open Control Panel
2. Double click Internet Options
3. Select General tab
4. Press Clear History-button
5. Select Content tab
6. Press Auto Complete-button
7. Make sure that Web Addresses is checked and press Clear Forms
8. Press Ok-button
9. Also check that no entries is listed at the following registry key:

   [HKEY_CURRENT_USER \Software \Microsoft \Internet Explorer \TypedURLs]
   
   More info MS KB Q157729
   

One can configure for how long it should remember a typed url:

1. Open Control Panel
2. Double click Internet Options
3. Select General tab
4. Change Days to Keep Pages in History
5. Press Ok-button
6. It should be reflected with this registry key:

   [HKEY_CURRENT_USER \Software \Microsoft \Windows \CurrentVersion \Internet Settings \Url History]
   Days To keep = 15

More info MS KB Q217148
More info MS KB Q221925
More info MS KB Q237553
More info MS KB Q885180