Challenger was a specialized-app built for heroes to solve the issues between the heroes.
When the talk was no longer an option to resolve a conflict between heroes. They could issue a challenge through the Challenger hence the app named Challenger.
The unique thing about the challenger app was the fact that the challenger had to gain the approval of the citizens and the heroes to challenge the person they wanted to challenge.
The citizens who were the ordinary people in this case were given a right to approve or disapprove of the challenge.
The challenger also had to list the reasons why they wanted to challenge the person. Heero was reading through all of it and looked at his wife with a flabbergasted look.
He never heard this challenger thingy before so he was puzzled when he read those.
