What is the responcebility of a informatica production support member?

Hi
I want to know What is the responcebility of a informatica production support member?
and what exactly a Infa prod support member has to do.
what r the common issue?
is there any book or docs availble for the same.

pls forward same to my id-rkishore.sharma@gmail.com

thanks a ton in advance.

Regards

ram