[fw-mvc] Sessions and passing them between websites

Hello,

I'm working on a part of a website where the idea is to be able to embed a form on another website, and then process that form through Action controllers on a site built using the Zend Framework.
I believe that I need to save the form in a session variable and redirect the user to the Action Controller, I'm just not that sure how to go about it. I haven't done much work with Sessions, or forms which will post the entered information into a session variable. Any tips would really be appreciated. I'm sort of in uncharted water with this.

Regards,
Thomas