Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As String) As Long
Private Const WM_SETTEXT = &HC
Private Sub Command1_Click()
SendMessage &H20DCC, WM_SETTEXT, 0, ByVal "txt"
End Sub