Public Class Form1
    Public Declare Function EnumWindows Lib "user32.dll" (ByVal lpEnumFunc As _
      EnumWindowsProc, ByVal lParam As Int32) As Int32
    Public Declare Function IsWindowVisible Lib "user32.dll" (ByVal hwnd As _
    IntPtr) As Boolean
    Public Delegate Function EnumWindowsProc(ByVal hwnd As IntPtr, ByVal lParam _
    As Int32) As Boolean
    Public Declare Function GetWindowText Lib "user32.dll" Alias _
    "GetWindowTextA" (ByVal hwnd As IntPtr, ByVal lpString As String, ByVal cch _
    As Int32) As Int32
    Public Declare Function GetWindowTextLength Lib "user32.dll" Alias _
    "GetWindowTextLengthA" (ByVal hwnd As IntPtr) As Int32
    Public Declare Function GetWindowLong Lib "user32.dll" Alias _
    "GetWindowLongA" (ByVal hwnd As IntPtr, ByVal nIndex As Int32) As Int32
    Public Declare Function GetParent Lib "user32.dll" (ByVal intptr As IntPtr) _
    As IntPtr
    .....