process
The current fiber has been asked to temporarily cease running for an inter-nybblecode interrupt for some reason. It has possibly executed several more L2 instructions since that time, to place the fiber into a state that's consistent with naive Level One execution semantics. That is, a naive Level One interpreter should be able to resume the fiber later (although most of the time the Level Two interpreter will kick in).
Parameters
continuation
The reified continuation to save into the current fiber.