Editing History of the Internet (section)

==== Telegraphy ====
:The practice of transmitting messages between two different places through an electromagnetic medium dates back to the [[electrical telegraph]] in the late 19th century, which was the first fully digital communication system. [[Radiotelegraphy]] began to be used commercially in the early 20th century. [[Telex]] became an operational [[teleprinter]] service in the 1930s. Such systems were limited to [[Point-to-point (telecommunications)|point-to-point communication]] between two [[End system|end devices]].