If the two computers are on a LAN, then you plug the printer into one computer and you could print on it from the other computer too (installing the driver for it and change the port from lpt1: to path and name of the printer as it appears in the network). The problem is that the computer in which the printer is plugged in must be turned on to be able to print. The simplest way around this is to buy a network adapter for the printer and installing it as a network printer.