Newsgroups: news.software.b
Path: utzoo!henry
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Duplicate checking, how?
Message-ID: <1991Apr1.172957.9112@zoo.toronto.edu>
Date: Mon, 1 Apr 1991 17:29:57 GMT
References: <1991Mar30.212159.16368@mthvax.cs.miami.edu>
Organization: U of Toronto Zoology

In article <1991Mar30.212159.16368@mthvax.cs.miami.edu> wb8foz@mthvax.cs.miami.edu (David Lesher) writes:
>How do sites with multiple NNTP feeds keep from getting thousands of
>duplicates?

NNTP is an interactive protocol; those other sites don't feed you
duplicates because they ask you "do you have xxx already?" before they
send it.

>Where in Cnews are such items as what you send to whom, and what
>you receive from whom, set?

The sys file decides the vast majority of such issues.  See news(5).
-- 
"The stories one hears about putting up | Henry Spencer @ U of Toronto Zoology
SunOS 4.1.1 are all true."  -D. Harrison|  henry@zoo.toronto.edu  utzoo!henry