IBM VNET
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VNET is an international computer networking system deployed in the early 1980s and still in current, but highly diminished use. It was developed inside 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