IBM VNET
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VNET was a nationwide computer networking system deployed in the early 1980s and still in current, but highly diminished use. It was developed by IBM, and provided the main email and file-transfer backbone for the company throughout the 1980s and 1990s. Through it, a number of protocols were developed to deliver e-mail amongst time sharing computers over alternate transmission systems.
See also
V-Net is also a term used to describe a subnetted VLAN