It is possible for the DemoControlHD app to send data to a web server. This can be used to accomplish various tasks, depending on the web server, and essentially sends a GET request to the server (as if you typed the address in a web browser and pressed 'Go').
Obviously the web server in question must be ‘listening’ to these requests & perform some action for this to be useful – however it can be used, for example to send an SMS text message through a http gateway, or to control XBMC etc.