Back from that trip now - thanks for all the answers.
Lots of things to study.
Why put the printer on a port? Both hard wired computers have their own functions and both have cheap and unexciting printers connected directly (for doing their own jobs).
The network printer is multi-function. Fax, scanner, copier, dual paper tray (A4 for my CAA stuff, Letter for my USA stuff), double sided printer for the bigger documents and manuals. Often set it churning away doing its stuff and then print the notes and garbage on the individual printers in the meantime.