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Instead it was an undergraduate named Charley Kline, under the eye of Crocker and Cerf, who put on a telephone headset to coordinate with a researcher at SRI while typing in a login sequence that he hoped would allow his terminal at UCLA to connect through the network to the computer 354 miles away in Palo Alto. He typed in “L.” The guy at SRI told him that it had been received. Then he typed in “O.” That, too, was confirmed. When he typed in “G,” the system hit a memory snag because of an auto-complete feature and crashed. Nevertheless, the first message had been sent across the ARPANET, and if it wasn’t as eloquent as “The Eagle has landed” or “What has God wrought,” it was suitable in its understated way: “Lo.” As in “Lo and behold.” In his logbook, Kline recorded, in a memorably minimalist notation, “22:30. Talked to SRI Host to Host. CSK.”101
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Walter Isaacson (The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution)