at boot to desktop of user ‘pi’
yes, that is what i show you.
did you try the 2 command files
if not exist make sub dir
mkdir /home/pi/.config/autostart/
nano /home/pi/.config/autostart/myautostart.desktop
nano /home/pi/.config/autostart/start_processing
chmod +x /home/pi/.config/autostart/start_processing
do you have questions to that procedure?
very good
that is not a description we can help you on.