He has also taught several classes on Internet, TCP/IP and Open Systems Networking.
He has also taught several classes on Internet, TCP/IP and Open Systems Networking.
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=== Email ===
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Mr. Crocker is often reffered as one of the Inventors and Designer of E-mail. He developed [[MS]], based on the design of [[MSG]], which was the first modern Email sender program. MS was designed for UNIX operating system. Its idea was initiated by Steve Walker, who was then the Program Manager at [[DAPRA]].