julianop:
Here's what happens, again.I open window 1, Mega2560, USB port 6, let's say. I then open window 2, Pro Mini, port 7, let's say.
I do a few edits to window 1, make, and upload/run.
Leaving that window open, I make some edits in window 2, and upload/run.
I presume when you say "window 1" you are referring to an instance of the Arduino IDE.
The whole point about my Python program is that the editing is NOT done using the IDE. I use the Geany editor.
...R