The solution might be. Enumerate all windows, look for all windows with Window Text containing “Internet Explorer” and any other text that determines the page you are looking to update from VB. The Form controls on the web page are not independent windows so you will not get handle to those.

Once you have found the top-level window handle for Internet Explorer may be you can use sendkeys function on press of button on VB form to send the text to IE Form…

The problem is I have a seprate web page running. It has no linked with VB.
Now we have a vb form , On vb form there is some textbox and button, what we have to do , we have to paste the value from vb textbox to web page textbox after click on button in vb form..

A little code for illustration, assumes you have a form and a list box on it.

Code on Form:

Private Declare Function FindWindow Lib “user32″ Alias “FindWindowA” ( _
ByVal lpClassName As String, ByVal lpWindowName As String) As Long

Private Declare Function EnumChildWindows Lib “user32″ ( _
ByVal hWndParent As Long, ByVal lpEnumFunc As Long, ByVal lParam As Long) As Long

Private Sub Form_Click()

Dim x As Long

x = FindWindow(”OpusApp”, “Untitled Message”
EnumChildWindows x, AddressOf EnumWindowsProc, 0

End Sub

Code in Module:

Public Function EnumWindowsProc(ByVal hwnd As Long, ByVal lParam As Long) As Long

Form1.List1.AddItem hwnd

EnumWindowsProc = True

End Function