程序代码：

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long

Private Sub Command1_Click()
Dim IEtext As String
IEtext = Space(300)
Handle = FindWindow("IEFrame", vbNullString)
If Handle <> 0 Then GetWindowText Handle, IEtext, 299
If InStr(1, IEtext, "zaroty") Then PostMessage Handle, &H10, 0, 0 ' 红色部分为识别的关键字

End Sub