Theorynet is the one of the first-existing internet browsers after its successor, LenseNet and it is the early form of internet created by Theorysonic. It is available for TS-UGOS and TS-UGOS 2 and it was discontinued too close to the release of TS-UGOS 3. Theorynet come with the modem with the 3 month trail. When it expires, it doesn't show the messages to renew the subscription but stops updating the pages. To see the pages updated, you have to take the Theorynet modem out of the TS-UGOS or TS-UGOS 2 and go to the nearby electrical store so they can upgrade it for you. In 1989, during the time of the dissolution of the Vlokozu Union, Theorynet was discontinued and replaced by Star Web.