help on finding app instance

How do I check to see if there already is an instance of my applications running? Say I have an installer and I want to check to see if it's already running so that when the user clicks on the executable it doesn't do anything.

[Serge]

You can use App.PrevInstance to check it:

Private Sub Form_Load()
    If App.PrevInstance Then
        MsgBox "Application is already running."
        End
    End If
End Sub