20. A method as recited in claim 19 , further comprising performing the second subsequent command uttered by the different user at least partly in response to the different user uttering the predefined utterance or the other predefined utterance.
19. A method as recited in claim 16 , wherein the disregarding comprises refraining from performing the second subsequent command for the different user, and further comprising requesting that the different user utter the predefined utterance or another predefined utterance.