如果教师不知道哪个终端模拟器窗口与该学员对应，可以要求学员输入特定形式的关键字，然后查看哪个窗口显示了该关键字。
If the instructor does not know which terminal emulator window corresponds to the student, he or she can ask the student to enter a keyword on a particular form and see which window displays it.
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