http://www.mvps.org/emorcillo/en/code/vb6/wbframe.shtml

Getting the IWebBrowser2 interface for each HTML frame

This code enumerates the frames of a HTML page loaded in the WebBrowser control to get they IWebBrowser2 interface.
Note: This tip is based on the Microsoft KB article 196340 and requieres the OLELIB.TLB type library.

EnumFrames
Sub EnumFrames(ByVal wb As WebBrowser)
Dim pContainer As olelib.IOleContainer
Dim pEnumerator As olelib.IEnumUnknown
Dim pUnk As olelib.IUnknown
Dim pBrowser As SHDocVw.IWebBrowser2

   Set pContainer = wb.Object.Document
  
   ' Get an enumerator for the frames
   If pContainer.EnumObjects(OLECONTF_EMBEDDINGS, pEnumerator) = 0 Then
  
      Set pContainer = Nothing
     
      ' Enumerate and refresh all the frames
      Do While pEnumerator.Next(1, pUnk) = 0
        
         On Error Resume Next
        
         ' Clear errors
         Err.Clear
        
         ' Get the IWebBrowser2 interface
         Set pBrowser = pUnk
  
         If Err.Number = 0 Then
            Debug.Print "Frame: " & pBrowser.LocationURL
         End If
  
      Loop
     
      Set pEnumerator = Nothing
  
   End If
  
End Sub