Remote invocation of mobile device actions

1. A computer-implemented method performed by a data processing apparatus, comprising:

accessing, in response to an input at a first user device, specification data for a second user device that specifies a set of user device actions that the second user device is configured to perform, wherein each user device action is an action performed by a respective application installed on the second user device;

receiving command inputs for the first user device;

for each command input, determining whether the command input resolves one of the user device actions of the set of user device actions for the second user device, the one of the user device actions being an action that can be performed by a respective application installed on the second user device; and

for each command input determined to resolve one of the user device actions at the second user device:

generating data that causes the first user device to display a dialog in a user interface of the first user device by which a user of the first user device may either accept or deny invoking the user device action of the respective application at the second user device in response to the command input;

in response to an acceptance:

generating a command communication that includes data that, when processed by an application programming interface on the second user device, causes the second user device to invoke the user device action and process the command input as the input for the user device action;

sending the command communication to the second user device; and

in response to a denial, through the dialog and by the user at the first user device, to invoke the user device action at the second user device, causing the first user device to invoke the user device action of the respective application installed on the first user device and process the command input as an input for the user device action.

2. The computer-implemented method of claim 1 , wherein causing the second user device to invoke the user device action and process the command input as an input for the user device action comprises:

generating a command communication that includes data that, when processed by an application programming interface on the second user device, causes the second user device to invoke the user device action and process the command input as the input for the user device action; and

sending the command communication to the second user device.

3. The computer implemented method of claim 1 , further comprising, for each command input not determined to resolve to any of the user device actions, causing the command input to be processed at the first user device.

4. The computer-implemented method of claim 1 , wherein the second user device is a smart phone.

5. A system, comprising:

a data processing apparatus and a computer storage apparatus in data communication with the data processing apparatus and storing instructions executable by the data processing apparatus and that upon such execution cause the data processing apparatus to perform operations comprising:

accessing, in response to an input at a first user device, specification data for a second user device that specifies a set of user device actions that the second user device is configured to perform, wherein each user device action is an action performed by a respective application installed on the second user device;

receiving command inputs for the first user device;

for each command input, determining whether the command input resolves one of the user device actions of the set of user device actions for the second user device, the one of the user device actions being an action that can be performed by a respective application installed on the second user device; and

for each command input determined to resolve one of the user device actions at the second user device:

generating data that causes the first user device to display a dialog in a user interface of the first user device by which a user of the first user device may either accept or deny invoking the user device action of the respective application at the second user device in response to the command input;

in response to an acceptance:

generating a command communication that includes data that, when processed by an application programming interface on the second user device, causes the second user device to invoke the user device action and process the command input as the input for the user device action;

sending the command communication to the second user device; and

in response to a denial, through the dialog and by the user at the first user device, to invoke the user device action at the second user device, causing the first user device to invoke the user device action of the respective application installed on the first user device and process the command input as an input for the user device action.

6. The system of claim 5 , wherein causing the second user device to invoke the user device action and process the command input as an input for the user device action comprises:

generating a command communication that includes data that, when processed by an application programming interface on the second user device, causes the second user device to invoke the user device action and process the command input as the input for the user device action; and

sending the command communication to the second user device.

7. The system of claim 5 , further comprising, for each command input not determined to resolve to any of the user device actions, causing the command input to be processed at the first user device.

8. The system of claim 5 , wherein the second user device is a smart phone.

9. A non-transitory computer readable storage medium in data communication with a first user device and storing instructions executable by a data processing apparatus and upon such execution cause the data processing apparatus to perform operations comprising:

accessing, in response to an input at a first user device, specification data for a second user device that specifies a set of user device actions that the second user device is configured to perform, wherein each user device action is an action performed by a respective application installed on the second user device;

receiving command inputs for the first user device;

for each command input, determining whether the command input resolves one of the user device actions of the set of user device actions for the second user device, the one of the user device actions being an action that can be performed by a respective application installed on the second user device; and

for each command input determined to resolve one of the user device actions at the second user device:

generating data that causes the first user device to display a dialog in a user interface of the first user device by which a user of the first user device may either accept or deny invoking the user device action of the respective application at the second user device in response to the command input;

in response to an acceptance:

generating a command communication that includes data that, when processed by an application programming interface on the second user device, causes the second user device to invoke the user device action and process the command input as the input for the user device action;

sending the command communication to the second user device; and

in response to a denial, through the dialog and by the user at the first user device, to invoke the user device action at the second user device, causing the first user device to invoke the user device action of the respective application installed on the first user device and process the command input as an input for the user device action.

10. The non-transitory computer readable storage medium of claim 9 , wherein causing the second user device to invoke the user device action and process the command input as an input for the user device action comprises:

generating a command communication that includes data that, when processed by an application programming interface on the second user device, causes the second user device to invoke the user device action and process the command input as the input for the user device action; and

sending the command communication to the second user device.

11. The non-transitory computer readable storage medium of claim 9 , further comprising, for each command input not determined to resolve to any of the user device actions, causing the command input to be processed at the first user device.

12. The non-transitory computer readable storage medium of claim 9 , wherein the second user device is a smart phone.