ah, I think you all misunderstand my question. I am not talking about physically connecting a device to an Arduino Tx-Rx pair....
I am talking about using the Serial Monitor in the IDE - the one that comes up when you Tools - Serial Monitor (Ctl-Shift-M)
It logically attaches itself to the stream associated with Serial.write..blah blah....
Suppose I have two streams, Serial and Serial1. How do I direct Serial Monitor to attach to a specific serial stream??????? or can't I?
I am using a Mega bd that has 4 serial tx-rx pairs
j