Can anyone tell me which part of evince displays its contents?

[Javed Shaikh <friendjaved gmail com>]

Hi all
We are working on evince accessibility. Can anyone tell help us in this? 

We have a following queries.

1) Has anyone worked on this?
2) If not, is anyone working somewhere?
3) If yes, how part is achieved?
4) What is the widget where the content of .pdf files are displayed?
5) How to find the code for that widget in evince's source code?
6) What is the role of gail:atk-bridge"?


These are some of the questions, I am looking anwers for? 


Anyone knows the solution.

Thanks in advance.