10. A computer-readable storage device storing instructions that, when executed by a processor, cause performance of operations that comprise: receiving, by a computing device, a first orally-provided input that includes a first carrier phrase; and performing, by the computing device and in response to having received the first orally-provided input, an action by a first application program due to the first orally-provided input including the first carrier phrase, wherein the first carrier phrase is registered with the operating system of the computing device as being associated with the first application program for causing a command to be performed by the first application; wherein the computing device is configured to perform an action by a second application program due to orally-provided input including a second carrier phrase, wherein the second carrier phrase is registered with the operating system of the computing device as being associated with the second application program for causing a command to be performed by the second application.
16. The computer-readable storage device of claim 10 , wherein: the computing device is configured to perform an action by a third application program due to orally-provided input including the first carrier phrase; performing the action by the first application program rather than the third application due to the first orally-provided input including the first carrier phrase is due to the first application program executing and the third application program not executing when the first orally-provided input was received.