I have one USB printer, and 2 Macs (indeed 3, but only two are concerned 
One Mac runs OS 10.1.5, the other one runs OS X 10.2.5. They are not in the same room, but access the same Ethernet switch. IP addresses are dynamic (DHCP).
How can I share the USB printer ?

One Mac runs OS 10.1.5, the other one runs OS X 10.2.5. They are not in the same room, but access the same Ethernet switch. IP addresses are dynamic (DHCP).
How can I share the USB printer ?