The kernel or user space via some system event.

内核或用户空间，通过执行某些系统事件发出信号。

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The xev program output lists every X Window System event in the attached window.

xev 程序输出将在连接的窗口中列出每个 X Window System 事件。

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If a new row has not been created, then examine the system event logs for the cause.

如果未创建新行，则请检查系统事件日志确定原因。

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Analysts and industry watchers expect the company to announce details of its new Meego operating system at the event, an open-sourced mobile operating system on which it has been collaborating with Intel and hopes to use on high-end smart phones that compete with Apple's iPhone.

FORBES: Magazine Article

They had to learn how to use the system after the event, which seriously delayed the project.

ECONOMIST: A survey of software

To save the financial system in the event of a default, some sort of Argentine-style deposit freeze might be needed.

ECONOMIST: Brazil