You can also create a web service (WCF will be the easiest since creating interaction with a .NET application) and send commands from the client PC to the service, and the application (WP7) will read data through the service (for example, the service can transfer values ββto the device ) At the moment, you probably wonβt be able to get full control over the system, since the API does not provide developers with low level access to input hooks, but if the application is your own, all you need is a presentation layer on top of it.
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