[galaxy-dev] How does one create a viewer for a new datatype to display a webpage if eyeball is clicked?

Good afternoon, I am trying create a display module for a special binary datatype. When someone requests to view the output file in the History using the eyeball it will kick off my code to create an HTML display in the Galaxy center section. I am looking at binary.py but I am not sure if this is it. Is there sample or existing code to look at? I hope this makes sense to someone on the team. Thanks, bob