How bean binding takes place in JSF?

Hi all,
I would like to know how exactly is the bean binding talking place in the JSF. I was going through the JSF source code and am really stuck with it...I jus understood that ELResolver is being implemented...
Can anyone help with the name of the java file where exactly is the bean binding logic is written in ths JSF source code or atleast tell what is the approach taken for that....

thanks in advance,
arun

generally faces-config.xml, but if you are using spring, it can be injected via applicationContext<xxx>.xml file.