从windows NT 开始，就有了这个说法。依稀记得以前的电脑报上说过，但是忘了为什么。
查了一下wikipedia，是这样说的：
http://en.wikipedia.org/wiki/Control-Alt-Delete
Windows NT is designed so that, unless security is already compromised in some other way, only the WinLogon process, a trusted system process, can receive notification of this keystroke combination. This is because the kernel remembers the Process ID of the WinLogon process, and allows only that process to [...]
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