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From: Paul Ruizendaal <pnr@planet.nl>
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Subject: [TUHS] Re: when did v8 or later get networking?
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> URP is smaller, but if I remember well it does not handle out-of-order =
packets or packet duplicates (both of which do not occur in a (virtual) =
line switched context).

Upon reflection, duplicates of course can occur when an ACK is lost.