How to get form values on click of save button in orbeon

I have created a proxy portlet and deployed on life Ray portal, everything is working fine as expected. Now on click of save button I need get the form inputs and save it in db. As of now I haven't created a database layer for orbeon. On click of save button I need to hit the some url with inputs as parameters.. I have the following questions

1) Where will I get form inputs on click of save button(file name) ? 2) can it possible to pass the form inputs to jsp or java page?

3) if I want to disable some buttons in form runner, how can I do that? Any documentation that from where do I need to start for customization?