Tried it.. works ! Thank you.
At first I had both Picos plugged into a non powered USB hub. I found I had to plug one of them into one of my desktop ports directly then /dev/ttyACM1 appeared.
I want to use two Picos to operate an IR link from my house to my garden shed. It would be very useful to have one instance of Thonny connected to Pico A and another instance to Pico B. I could then code both from my desktop and see the interactions in the two Thonny instances. Ive connected two Pic...