[vtkusers] Proper Delete()ion of output?

[tom fogal]

In tracking the segfault I'm getting while trying to delete an object,
it occurred to me that maybe I was deleting things incorrectly.

It was my understanding that if I GetOutput() from a filter/source and
stored that pointer in wherever I was, that the reference count
increased and that I would then have to Delete() the object myself.

I guess my question is, exactly what operations will modify the
reference count of an object?

Thanks,

-tom