Interface Message ProcessorTeam (L to R): Truett Thatch, Bill Bartell(Honeywell), DaveWalden,Jim Geisman, Robert Kahn,Frank Heart, BenBarker, Marty Thrope, Will Crowther, Severo Ornstein. Not pictured:BernieCosell.

The Interface Message Processor provided a system independentinterface to the ARPANETthat could be used by any computer system,thereby opening the Internet network architecture from the verybeginning.

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