JVTOS (Joint Viewing and Tele-Operation Service) is an advanced teleservice to support cooperative work over distance which allows distributed users to work in a collaborative fashion with multimedia. JVTOS comprises facilities for session management, floor control, multimedia application sharing, telepointing and audio/video communication. JVTOS offers services for multimedia collaboration across high-speed networks and is primarily aimed at running in heterogeneous environments comprising different hardware platforms and also different operating and window systems. This paper describes the design of JVTOS as well as its implemeentation on different platforms which is currently under development.