>There's a screen that I always want to be opened in my app.
>
>How can I make it that if that screen is not active (for whatever reasons) it's activated again without user intervention?

Denis,

Don't let it go away in the first place

(1) You start the form when your app starts

(2) If the form is closed by the user - see ( ReleaseType == 1 in QueryUnload() ) do a NODEFAULT
The form will not disappear

Whether the form can be minimized is up to you