10. One or more computer-readable storage devices storing instructions that when executed by a processor, cause performance of operations that comprise: receiving, by a computing device, a first voice input that includes one or more first words; generating, by the computing device, first data that represents the one or more first words of the first voice input, wherein the first data represents an audio recording of the first voice input; identifying that the one or more first words of the first voice input have been reserved for a particular third-party application program that is installed on the computing device; receiving, by the computing device, a second voice input that that follows the first voice input and that includes one or more second words; generating, by the computing device, second data that represents the one or more second words of the second voice input, wherein the second data represents text of the one or more second words of the second voice input; and providing, as a result of having identified that the one or more first words of the first voice input are reserved for the particular third-party application program, the second data that represents the one or more second words of the second voice input to the particular third-party application program.
10. One or more computer-readable storage devices storing instructions that when executed by a processor, cause performance of operations that comprise: receiving, by a computing device, a first voice input that includes one or more first words; generating, by the computing device, first data that represents the one or more first words of the first voice input, wherein the first data represents an audio recording of the first voice input; identifying that the one or more first words of the first voice input have been reserved for a particular third-party application program that is installed on the computing device; receiving, by the computing device, a second voice input that that follows the first voice input and that includes one or more second words; generating, by the computing device, second data that represents the one or more second words of the second voice input, wherein the second data represents text of the one or more second words of the second voice input; and providing, as a result of having identified that the one or more first words of the first voice input are reserved for the particular third-party application program, the second data that represents the one or more second words of the second voice input to the particular third-party application program. 16. The one or more computer-readable storage devices of claim 10 , wherein the one or more first words were reserved for the particular third-party application program in response to a request, on behalf of the particular third-party application program by a developer of the particular third-party application program, to register the one or more first words.