>I inherited an app that has a call stack that goes
>
>Main.prg calls
> Form CAT calls
> Cat_Read.prg calls
> Form CatLis calls
> Cat_Listen.prg
>
>The Cat_Read.prg does a CAT.Release before it calls the form CatLis. I'm thinking this is not correct, since it's going to try to return to the CAT form before it can close the main program.
>
>Am I remembering correctly?

Mostly... the release will be delayed until the form's code is off the stack, but it should be done afterwards. Check in your debugger - put a breakpoint in form's release and see when exactly does it get released.

Same would happen if you had a reference to the form somewhere - you call its .release(), and it will be done as soon as the reference count is zero.

In both cases, you can start a coverage log and see when release took place.