In Windows NT 4, the video, server, and printer spooler subsystems were moved into kernel mode.
在 Windows NT 4 中，视频、服务器和打印机后台处理程序子系统被移动到内核模式。
Once the printer is unused, the spooler can send the job to the printer without fear of contention from other print jobs.
一旦打印机闲置，后台处理程序就可以将作业发送到打印机，而不必担心其他打印作业争用。
Even though printers can be attached to the network, a server is usually used as the spooler, which in turn prints to the printer over the network.
即便可以将多台打印机连接到网络，也通常使用一个服务器作为后台处理程序，该服务器然后通过网络打印到打印机。
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