oh, that explains why i couldn't find anything.
Hmm... no good huh? Well, I do have other documents on the GC (stuff that really can't publicly be posted...) but neobrain might have seen them already. They briefly touch upon zfreeze (for all of one whole sentence) and talk about coplanar technobabble but it doesn't look like enough to explain what it does. May be a clue if anyone wants to PM me about it.