You can do it with threads, but the simplest way is to use Net::Ping in syn/ack (asynchronous) mode. See Re: Optimized remote ping (syn/ack) for a little detail.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
In the absence of evidence, opinion is indistinguishable from prejudice.
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I wrote this back in 2003 .. hope it still works:
...The words of the Prophets are written on the Facebook wall.
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