No, the device with the browser is not a client or customer machine, but a dedicated device to reproduce multimedia content. Basically it´s a media player. It is programmed not to require user interaction, as the only controller of the dedicated device is also the controller of the server. Can you not work with server sockets on both sides, so that the server always accepts requests from player and vice versa. The only thing missing then is still...

I am looking for an isolated piece of code that uses XmlHttpRequest/JavaScript to download files from a (specified path on a) server to local machine. The browser on the local machine (Mozilla/FireFox) does not require user interaction.