The judge has to listen to what the witness, accused and defendant has to say.
The people in the court room have to listen to what the accused and defendant have to say. For instance, the Court assistant reads the charges against the accused.
The Crown counsel/ Attorney is a lawyer that collects evidence about the crime. He or she does this by asking the victim and the accused questions until the story becomes clear . The court reporter records every thing that the defendant and accused says. The Investigating officer investigates the crime and collects evidence.