17. A computer-implemented method comprising: at a computing device: receiving a verbal request to perform a function; causing speech processing to be performed on the verbal request; transmitting a code to an end-user device separate from the computing device; prompting to enter the code; detecting manual manipulation of a control element on the computing device, wherein the control element is used to cause entry of multiple values; emitting light externally of the computing device according to multiple appearance states, wherein a first appearance state corresponding to a first value is emitted upon detection of a first manual manipulation of the control element, and a second appearance state corresponding to a second value is emitted upon detection of a second manual manipulation of the control element; determining that at least one of the first or second values match the code; and performing the function.
17. A computer-implemented method comprising: at a computing device: receiving a verbal request to perform a function; causing speech processing to be performed on the verbal request; transmitting a code to an end-user device separate from the computing device; prompting to enter the code; detecting manual manipulation of a control element on the computing device, wherein the control element is used to cause entry of multiple values; emitting light externally of the computing device according to multiple appearance states, wherein a first appearance state corresponding to a first value is emitted upon detection of a first manual manipulation of the control element, and a second appearance state corresponding to a second value is emitted upon detection of a second manual manipulation of the control element; determining that at least one of the first or second values match the code; and performing the function. 22. A computer-implemented method as recited in claim 17 , wherein the control element comprises a rotatable knob, and detecting manual manipulation comprises interpreting a sequence of rotations of the knob.