From mboxrd@z Thu Jan  1 00:00:00 1970
From: zhc <zhenghongchao@hotmail.com>
Subject: Which two types signal cannot be produce in user program?
Date: Mon, 08 Nov 2004 10:38:36 +0800
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   Yesterday someone asked me the question. I don't know how to answer 
him, Who can tell me ? Thank you.