How does screen survive logout?

Michael Clark <[email protected]>
Newsgroups gmane.comp.gnu.screen.user
Message-ID <CAO=M5RpSo3ex8exiT4NvjNmBys_DnLoY15nNG51C5MCNuK1Ahg@mail.gmail.com> 
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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