para mandar un texto algo asi:
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, ByVal lpsz2 As String) As Long
Private Declare Function SendMessageSTRING Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As String) As Long
Private Const WM_SETTEXT = &HC
Private Sub Form_Load()
Shell "notepad.exe", vbNormalNoFocus
Dim vPadre As Long, vEdit As Long
Dim vTexto As String
vPadre = FindWindow("Notepad", vbNullString)
vEdit = FindWindowEx(vPadre, 0&, "Edit", vbNullString)
vTexto = "Cuando Jesús salió del templo y se iba, se acercaron sus discípulos para mostrarle los edificios del templo." & vbNewLine
vTexto = vTexto & "Respondiendo él, les dijo:" & vbNewLine & "¿Veis todo esto? De cierto os digo, que no quedará aquí piedra sobre piedra, que no sea derribada."
Call SendMessageSTRING(vEdit, WM_SETTEXT, 256, ByVal vTexto)
End Sub