Provocar la trasparencia de un formulario:

Escribir el siguiente código:
Private Declare Function SetWindowLong Lib "user32" Alias
"SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long,
ByVal dwNewLong As Long) As Long

Private Sub Form_Load()
Dim Resp As Long
Resp = SetWindowLong(Me.hwnd, -20, &H20&)
Form1.Refresh
End Sub