title: Java Server:Conferencing between lecturer and students by broadcasting
body: <p>Say there are 2000 connections to a server.
  10% of them are lecturers and lead a course, and at the same time conducting an online lecture. The remaining 90% of users are students who watch the lecture. </p>
  
  <p>What is the best way to broadcast this? Going through the server as lecturer sends the information to the server, and server refers to students? Or should students directly connect to speakers and have them broadcast information to the students without going through the server?</p>