>Who needs non-closeable forms? :)

Frameworks might need non-closable forms, i.e. form-based objects that aren't visible and shouldn't be released until shut-down time.

One example is Stonefield Database Toolkit, which I use in my own framework. In version 5.1 of SDT the base class for the DBCXMGR object is a form. Typically this object is instantiated when the app first starts and it stays alive (although never visible) until the app terminates. It's part of the _screen.forms collection so you have to take care, when looping through that collection and releasing forms, not to release DBCXMGR unless you're ready to shut down the app.