Abstract
Unattended receivers can preserve the appearance of an active communications path long after the originating terminal has ceased to answer. This paper defines a human-origin challenge procedure for retained relay systems and documents failure cases observed in early K-Series field deployments.
Operators are instructed not to treat carrier presence, handshake completion, or returned machine traffic as evidence of a human operator.
Recovered note
The surviving index references a return path established on 1993.12.17 at 02:14 UTC. The associated node identifier was removed from the public research index during normalization.
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