Login form in MDI app

I have a modeless login form which, on successfull login, opens an MDI form. So far so good. I have a little problem closing or exiting the app since the login form is not a child of the MDI form. The code goes something like this: APPLICATION START ------------------------------------ LOGIN FORM ------------------------------------ dim MDIform as new mdi_form MDIform.show me.hide ------------------------------------ APPLICATION END ------------------------------------ MDI FORM ------------------------------------ ??? (Any ideas?) ------------------------------------