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How does screen survive logout?

From: Michael Clark
Subject: How does screen survive logout?
Date: Fri, 21 Feb 2014 13:17:32 -0600

I'm fairly new to linux and I am just curious as to how screen manages to survive the logout process. I don't know the logout process really works either but I assume that screen manages to ignore the signal sent to all the process I own when I logout. I thought that was SIGHUP but when I do kill -HUP <screen pid> it kills the session. Can someone explain how this works?

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