Talking to Photoshop over TCP

_server.jsx

(function() {
  var loop = true,
      tcp = new Socket,
      psd = app.activeDocument; // i.e., `psd` is the current open document in Photoshop.
  
  var run = function() {
    // Server is running a port 1234:
    while(loop) {
      var connection = tcp.poll();
      if (connection != null) {
        connection.writeln('name: ' + psd.name); // The name of the PSD when it was created.
        connection.close();
        delete connection;
        loop = false; // end execution of the script
      }
    }
  };
  
  if (tcp.listen(1234) && psd) run();
}());

bash.sh

$ nc localhost 1234 # prints the name of the PSD, from the Photoshop TCP server!