I'm helping a client with a CRT claim (pro bono) and it's really not the greatest experience. I applied to be their representative and the CRT denied it since they don't want legal representation involved. The CRT said I could be a "helper" instead.
A helper can do anything except speak for the party at a hearing, make binding agreements, and communicate with the CRT directly.
So I basically drafted the messages and written arguments, which the client then reviewed and submitted.