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Last updated on 2008-06-06.
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http://vigna.dsi.unimi.it/lifekeeper/
lifekeeper is a completely trivial program that prints an ASCII NUL character every 30 seconds. This has no effect visually, but if someone is watching the connection for activity it will see some. People using remote connections through firewalls might find it useful, as often masquerading firewalls are configured so to shut down connections that appear not to be active for some time.