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 receive [...]
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