how to design a protocol to help 1000 PCs know whether online or not

To: debian-user@lists.debian.org
Subject: how to design a protocol to help 1000 PCs know whether online or not
From: Serena Cantor <qipaishi2006@yahoo.com>
Date: Thu, 29 Dec 2005 16:08:11 -0800 (PST)
Message-id: <[🔎] 20051230000811.68735.qmail@web35704.mail.mud.yahoo.com>

(Sorry, I know this is not suitable place to post this question. If you know where I should post, pls let me know.)

There are 1000 PCs, each know these 1000 PC's IP address, each is equal. How to design a protocol for every PC to find out the other PCs are still online? Thank you!!!

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