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NT had a built in messenger service that operated on named pipes. It was one of those services you disabled as soon as you could.

• merb 4y ago
  net send *
• pdntspa 4y ago
  I got into so much trouble as a kid for abusing that...
• virgulino 4y ago
  To be fair, it was a local network toy, more akin to "talk" or "finger" in Unix.