ISABEL Experimental Distributed Multimedia Application Experiments over Broadband Networks Juan Quemada Vives, Tom´ as P. de Miguel, Arturo Azcorra, Santiago Pav´ on, Joaqu´ in Salvachua, Manuel Petit. DIT/UPM, Espa˜ na. Pedro Lu´ is Chas Alonso, Carlos Acu˜ na, Lidia Rodriguez Yamamoto. Telef´ onica I+D, Espa ˜ na. Vasco Lagarto, Joao Vastos, Francisco Fontes. CET, Portugal. ABSTRACT This paper aims to show the benefits and the experiences of ISABEL application ??. The aim of ISABEL is to assess the benefits of New Distributed Multimedia Applications using Integrated Broadband Communications (IBC) to support modern cooperative services. In contrast to single user computer applications, distributed collaborative systems consists of both the inter- connection technology and the people who are interconnected. ISABEL application has been developed inside ISABEL (I2001) and IBER (RACE 93117) projects, to demonstrate the real usage of ATM technology in two different fields: 1. The first one is a particular configuration of the ISABEL application specially devoted to offer computer support distance learning facilities. This Tele Education Application is developed in order to allow two types of tele-teaching. One oriented to individual training and the second oriented to support the real time remote distribution of a conference between big auditoriums. 2. The second is devoted to provide an advanced distributed multimedia application in the field of Computer Support Cooperative Work (CSCW). This application allows users to maintain computer support conference in order to exchange information, edit documents or distribute special presentations. This paper is devoted to summarize the application functionality and the main usage experiences in the filed of tele-education. 1 Introduction The global telecomunications industry is currently one of the most intensive areas of technology development. The technology base of advanced communications extends the full range within the convergence of the micro- electronic revolution, from information technology to entertainment and telecommunications. Users are looking towards ATM technology as a suitable solution for specific applications in the new field of the distributed multimedia. Operators are preparing marketing plans in order to offer advanced telecomunications services with a completely different commercial approach. Telecom manufacturers are now launching new products. The overall environment is now under evaluation, the customers are few and fibre based infrastructures are under development.