Using a neural interface helmet, it was possible for an individual to upload their mind to the Hypernet their body was kept alive in a cataleptic trance. The Seventh Doctor and Ace used this technology to upload their minds and fight the Nucleus of the Swarm in the Hypernet. (AUDIO: Revenge of the Swarm)
Lenny Sprang won his place in the Game of Death in an online hypernet competition by guessing the games coordinates. (PROSE: The Game of Death) According to the Seventh Doctor, TG tablets had "full trans-galactic internet access". (AUDIO: A Death in the Family)
Behind the scenes
No concrete connection is made between the two intergalactic servers, but they are both given the same definition.