FindWindow & Close Window

[AskProf]

Are you often annoyed by the auto pop-up IE window?

That's why I want to write a program to find and close all such pop windows. I noticed a kind of window by spy++. Its class is "Internet Explorer_Server". And I tried the following code:

Dim hwnd As Long

hwnd = FindWindow("Internet Explorer_Server", vbNullString)

If hwnd <> 0 Then
SendMessage hwnd, WM_CLOSE, 0&, 0&
End If

The hwnd is always 0 though there is a pop window which class is "Internet Explorer_Server"!

What's the problem?