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Many meetings at Cern use EVO. To access these meetings one has usually two options
The agenda-pages usually provide a link that you can use to connect to the meeting. You will need to have an Evo-account. You can register at https://evo.caltech.edu/evoGate/Profile/register.jsp
If the links on the agenda-pages do not work, you most likely need to install a Java Runtime Environment (JRE) or configure Java Web Start.