what's the difference among "session"&"backend"&"process"?

From: "rancpine cui" <rancpine(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: what's the difference among "session"&"backend"&"process"?
Date: 2007-04-22 07:04:10
Message-ID: 306760850704220004s35873fffsd4a7bd7540d44e1f@mail.gmail.com
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Hello
I am confused about the ideas of "session"&"backend"&"process" when I
read the lmgr part of source code. What's the difference among them?

Thanks,
Ranc.

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