This is a short example how to get the Node.js package serialport up and running with Windows 7 (this should also work for higher versions of Windows, but I didn't test that).
By using this package, you will be able to send and receive data to and from the serial port of your Arduino or any other device, using this port.
As of September 16, 2015, serialport does not compile using Node.js version: v4.0.0