Why SW_ - params in ShelExecute() not work

[Colonel]

Please, help! I must work with IExplorer at "background" (minimized). But if I use ShellExecute() as ShellExecute(hWindow, vbNullString, strURL,"", "", SW_MINIMIZE) it don't minimize IE-window. I check aslo SW_SHOWMINNOACTIVE and SW_SHOWMAXIMIZED and all others. But without result
My code:
Private Sub Form_Activate()
'I need open IE automaticaly at the beginning time of my application. I use Shell(). And I don't need IE "small window" (with version number etc.) splashing so I use SetWindowPos()
lngOnTop = SetWindowPos(Me.hwnd, HWND_TOPMOST, 0, 0, 0, 0, (SWP_NOMOVE Or SWP_NOSIZE))
lngProcessID = Shell(strIEPath & " " & strURL_1, vbMinimizedNoFocus) 'it's WORK. IE minimized
lngOnTop = SetWindowPos(Me.hwnd, HWND_NOTOPMOST, 0, 0, 0, 0, (SWP_NOMOVE Or SWP_NOSIZE))

'Now Timer begin work for checking URL errors as "404", "Cannot find server" etc.
Private Sub tmrTimer_Timer()
'I get handle of IE-window - hWindow
'I get it's Title.
'If there are "HTTP 404" or "Cannot find server" in the Title so I need to change URL at the same instance of IE
lngReturnValue = ShellExecute(hWindow, vbNullString, strURL_2, "", "", SW_MINIMIZE)
And at this time I see that IE window opens from TaskBar. Why??? I check ALL SW_... but without triumph

Have you got all the SW_ constants?

Const SW_HIDE = 0
Const SW_MAXIMIZE = 3
Const SW_MINIMIZE = 6
Const SW_RESTORE = 9
Const SW_SHOW = 5
Const SW_SHOWMAXIMIZED = 3
Const SW_SHOWMINIMIZED = 2
Const SW_SHOWMINNOACTIVE = 7
Const SW_SHOWNA = 8
Const SW_SHOWNOACTIVATE = 4
Const SW_SHOWNORMAL = 1

[Colonel]

Yes, ALL of 11 SW_...