The names make it sound like some sort of event handler.
Both were identified as an interface from Shell32
using the code below:
I can't find either of these in the MSDN libraries. Google returned some pages with code where they appeared, but I didn't see anything that really described the interface.
Public Sub ListTypes()
Dim NS As String = "Shell32"
For Each t As Type In Assembly.GetExecutingAssembly().GetTypes()
If (t.IsClass Or t.IsInterface) And t.Namespace = NS Then
Debug.Print(t.Name)
End If
Next
End Sub
Based on the definition in
ShlDisp.h
it appears to simply be a thin wrapper aroundIDispatch
with a different GUID.It seems to be used in obtaining event notification from the shell - Raymond Chen's blog has some example code.