static extern TODO  InternetQueryOption (TODO);

Declare Function  InternetQueryOption  Lib "wininet.dll" (TODO) As TODO

static extern bool InternetQueryOption(IntPtr hInternet, uint dwOption, char[] lpBuffer, ref int lpdwBufferLength);

<DllImport("wininet.dll", SetLastError:=True)> Shared Function InternetQueryOption(ByVal hInternet As IntPtr, ByVal dwOption As UInteger, ByVal  lpBuffer() As Char, ByRef lpdwBufferLength As Integer) As Boolean

[DllImport("wininet.dll", EntryPoint = "InternetQueryOption")]

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wininet/wininet/internetqueryoption.asp

For querying current settings use InternetQueryOption.