You can create yourself a service that will send you json or xml. it can be easily created using mono, python, Ruby, php or any other technology that is convenient for you.
You can build it in a relaxed manner where all you have to do is call the URLs in an HTTP GET to get the data that you process using services.
and use HTTP POST to post changes to your service.
you can make calls from this service from WP7 and consume data.
WP7 does not support sockets at the moment. Thus, your best bet is to transfer your payload through HTTP.
As I mentioned earlier, if you have access to the configuration of computers. You can run Mono, which is not too far from .Net in terms of language and functionality.
Next, from your phone, you can use the Rx library to make these Async calls and respond to your application.
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