在启用假脱机时需要指定一个文件，显示的输出会写入其中。
A file needs to be specified while enabling spooling, in which the display output is written.
最值得注意到莫过于脱机帮助文件的显示方式。
The most notable is probably the way help files are displayed when running in off-line mode.
经过一些脱机操作之后(本例将任务标记为已完成)，再切换回联机状态，显示结果大致如图4所示。
After some offline manipulation (in this case marking tasks as completed), and switching back online, the display might look something like Figure 4.
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