debug messages sent to arduino from processing

Is there a way to debug the Serial bytes received to the arduino when a processing sketch is the sender?

So basically processing is well... processing and sending information to the arduino. I can't seem to turn on the serial monitor, because the COM port is being used by Processing. Is there any other way to verify or observe the data coming through to arduino? Another logging utility or even a callback to processing, so that it could print what was received.

thx

You could "echo" the recieved data back to Prossesing and have Prossesing display it somehow.