I understand how many of the spells in Ultima 6 work, but these two spells are two spells whose exact mechanics I am not familiar with. Anyone care to enlighten me?

Specifically, I want answers to questions like the following:
* Where do items the spell is cast on go? In particular, is there a way, using cheats, to retrieve such items (without casting Reappear)?
* If Vanish is cast multiple times, what happens when Reappear is cast?
* Is there a way to place a charge in the vanished area (so that casing Reappear will give you that charge)? (A charge will appear on the ground if you cast Enchant on a staff, and then Animate said staff.)
* How do Vanish and Reappear behave when it comes to containers? (Note that this includes things like non-empty spellbooks and staves with charges in them.)
* If you Vanish a corpse (or get a corpse there some other way), and then cast Armageddon, will the corpse still be there?
* Any cases of strange behaviors with these spells? (Doesn't matter whether they're exploitable, or if this can crash or softlock the game; I still want to know.)