Use of EXTERN

From	Tom Young <tyoung37@gmail.invalid>
Newsgroups	comp.lang.c
Subject	Use of EXTERN
Date	2011-06-30 20:38 +0000
Organization	Aioe.org NNTP Server
Message-ID	<iuimrb$9c$1@speranza.aioe.org> (permalink)

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Hi all.  I've read through all the K&R2 chapters and I'm now reading the 
appendices.
Specifically, I'm reading section A11 - Scope & Linkage p227.  I have a
question about the "extern" property.

Section A11.2 Linkage p228 says:

"All declarations for the same object or function identifier with external
linkage refer to the same thing, and the object or function is shared by
the entire program."

and

"... the first external declaration for an identifier gives the identifier
internal linkage if the static specifier is used, external linkage
otherwise."

My questions are, is there any point to declaration an external object
"extern"?  Does it have any effect(s)?  I'm almost positive I've seen code
with external declarations that included the keyword "extern", but given
the quoted statements above, that seems redundant.  Am I missing
something?

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Use of EXTERN Tom Young <tyoung37@gmail.invalid> - 2011-06-30 20:38 +0000
  Re: Use of EXTERN pete <pfiland@mindspring.com> - 2011-06-30 17:37 -0400
  Re: Use of EXTERN James Kuyper <jameskuyper@verizon.net> - 2011-07-01 07:11 -0400

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