C# Definition:

[Flags]
enum AUTOCOMPLETEOPTIONS {
   // No autocomplete.
   ACO_NONE = 0,

   // Enable the autosuggest drop-down list.
   ACO_AUTOSUGGEST = 0x1,

   // Enable autoappend.
   ACO_AUTOAPPEND = 0x2,

   // Add a search item to the list of completed strings. Selecting this item launches a search engine.
   ACO_SEARCH = 0x4,

   // Don't match common prefixes, such as "www.", "http://", and so on.
   ACO_FILTERPREFIXES    = 0x8,        

   // Use the TAB key to select an item from the drop-down list.
   ACO_USETAB = 0x10,

   // Use the UP ARROW and DOWN ARROW keys to display the autosuggest drop-down list.
   ACO_UPDOWNKEYDROPSLIST = 0x20,

   // If ACO_RTLREADING is set, the text reads in the opposite direction from the text in the parent window.
   ACO_RTLREADING = 0x40
}

VB Definition:

Enum AUTOCOMPLETEOPTIONS
   TODO
End Enum

Notes:

None.