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Date: Mon, 09 May 2011 22:56:13 -0700
From: niujin <pippo.oxford@gmail.com>
To: linux-nfs@vger.kernel.org
Subject: nfs's interface and unix fs system call
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Hi everyone, I'm new to nfs and I read a line of words refering to NFS 
in <Distributed Systems --- Concepts and Design>:
"User programs can access files via Unix system calls without 
recompilication or reloading"

My question is, as far as I know, unix system call include "open" 
operation while NFS server operation does not, it seems to be 
contradictary to the quotings above, why?