Other core events include ctrlaltdel , which indicates that you pressed Ctrl-Alt-Delete , or kbdrequest , which is used to indicate that you pressed the Alt-Up arrow key combination .
其他核心事件包括ctrlaltdel，它说明您按下了Ctrl-Alt-Delete，或kbdrequest，它用来说明您按下了Alt-Up（向上箭头）键组合。
ctrlaltdel