Most home printers don't have their own network interfaces; the ability
to network an average home inkjet printer depends on plugging the
printer into a turned-on computer and telling the computer to share
its printer. (Larger and more powerful printers can have their own
identity on the network just like a computer does.)
So let's assume that an ordinary inkjet printer is plugged into Desktop's
USB port, and that the printer drivers have been installed on Desktop.
During the installation process, the printer was identified as a shared
printer, so that any other computer on the local network can print
from it.