1. A system, comprising a computer, the computer comprising a processor and a memory, wherein the computer is configured to: receive input including at least one word; determine that the input is specified as a command in a plurality of grammars, each of the two or more grammars being associated with a respective application in a plurality of applications; select one of the applications to which to apply the command according a status of the application with respect to a human machine interface associated with the application; and provide the command to the selected one of the applications.