A collective biography or a group biography.
On skype, you are able to message people of your choice, call a single person or multiple people, and even video chat one or multiple people.
A book about someone's' life is a biography.
autobiography
jeevani
Multiple IP PBX can share multiple call processors with the use of standard interface.
main character.
A biography
Erin Hunter is actually three people-four now, I think. But there are certainly multiple authors of the Warriors and Seekers series.
A biography is used for telling about people's life.
A multiple number is a multiple when you times it by something. This is what you call a multiple.
Ben Chichoski does not have an official biography. You can read a bit about him on the Call of Duty wiki page.
To educate people about the person who the biography is about.and to tell people about someone important in the past.