Theorynet, also known as Theorynet Browser, is a discontinued browser. Theorynet was a successor of LenseNet and it is available for TS-UGOS E1, TS-UGOS E2 and TS-UGOS 2 and it was discontinued too close to the release of TS-UGOS 3. Theorynet comes with any modem with a 3-month trial. When it expires, it doesn't show the messages reminding users to renew the subscription but stops updating the pages. To see the pages updated, users must take the Theorynet modem out of the TS-UGOS or TS-UGOS 2-based machine and go to a nearby electrical store so they can upgrade it for the user. In 1989, during the time of the dissolution of the Vlokozu Union, Theorynet was discontinued and replaced by Star Web.