6. A computer program product for conversational computing, the computer program product comprising: a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising: computer readable program code configured to execute code embodying a conversational virtual machine, register a plurality of input/output resources with a conversational kernel, provide an interface between a plurality of active applications and the conversational kernel processing input/output data, receive input queries and input events of a multi-modal dialog across a plurality of user interface modalities of the plurality of active applications, generate output messages and output events of the multi-modal dialog in connection with the plurality of active applications, manage, by the conversational kernel, a context stack associated with the plurality of active applications and the multi-modal dialog to transform the input queries into application calls for the plurality of active applications and convert the output messages into speech, wherein the context stack accumulates a context of each of the plurality of active applications.
6. A computer program product for conversational computing, the computer program product comprising: a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising: computer readable program code configured to execute code embodying a conversational virtual machine, register a plurality of input/output resources with a conversational kernel, provide an interface between a plurality of active applications and the conversational kernel processing input/output data, receive input queries and input events of a multi-modal dialog across a plurality of user interface modalities of the plurality of active applications, generate output messages and output events of the multi-modal dialog in connection with the plurality of active applications, manage, by the conversational kernel, a context stack associated with the plurality of active applications and the multi-modal dialog to transform the input queries into application calls for the plurality of active applications and convert the output messages into speech, wherein the context stack accumulates a context of each of the plurality of active applications. 8. The computer program product of claim 6 , further comprising providing conversational services and behaviors accessible by the plurality of active applications through a conversational engine application program interface.