You are right. I have not tried my current project on Win XP. I think my previous project did not look for \n. I think I was using a scheme that bracketed all of the data from the Arduino with some character. In the current project the stuff from the Adrunio is explicitly starting with \n as in Serial.print("\nMessage") Serial.print("rest of message"). It naturally happened that way because the Ardrunio side was built first using the serial monitor to debug the Arduino side of the scheme before starting the Processing side.
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