Distributed OneToMany broardast

Hi,

We are developing a e-learning system based on licode. There might be a lot
of students(500+) in a room. So we are thinking using multiple OneToMany
broardcast distributed on different machines. We know External input/output
could be used for this. But how should we implement with it?

We also want to know how many subscribers could a OneToMany processor
support in practice.

Thanks