APPle—Ⅱ微计算机由于价格低廉,操作方便,并配有各种语言及丰富软件,因而很多学校的实验室都采用它做语言教学和实习用机。作为教学用机。考虑到打印机的使用率不是很高,因此购机单位为节省开支,在配置计算机时,往往采取多主机配少量打印机的方法。从理论上讲,这样做完全可以满足教学的要求。但实际应用时,有些问题是难以避免的,如:上机时,配有打印机的用户不需要打印,而欲要打印的用户其主机又没配打印机,使得需打印的用户只能望 APPle-Ⅱ microcomputer because of its low price, easy to operate, and with a variety of languages ​​and rich software, so many schools laboratories have used it as a language teaching and practical use machine. As a teaching machine. Taking into account the use of the printer is not very high, so the purchase unit to save money in the configuration of the computer, often with multiple host with a small number of printers. In theory, doing so can fully meet the teaching requirements. However, in practice, some problems are unavoidable. For example, when a user is on a machine, a user with a printer does not need to print and a user who wants to print does not have a printer, which makes the user needing printing can only hope