title: Monitor a COM port already in use
body: <p>Is it possible to read from a COM port already in use on Windows XP? </p>
  
  <p>I would like to see the communication between some software and a device plugged into a serial device. I wrote a small program using C# to monitor the COM, but once it's in use by the other device it will not let you open it again. How can one monitor a COM port already in use? </p>
  
  <p>I'm open to third-party software.</p>