julianop:
I now go back to window A, sketch A, board A, port A, only to find out that window A thinks it's talking to a board of type B on port B. Clearly the sketch loaded in the window is sketch A, so I am at a loss as to why the IDE suddenly things it's talking to a board type B through port B.
Because my approach includes the type of board and the port name as comments at the top of the Arduino code there can be no mix up.
But I do appreciate that my odd-ball ideas are -- odd-ball.
...R