learning by example: twitter?

I have a form on my site, that after it submits.. I want to sends off
some data to some model, but stay on the page and reveals a new div/
form below. Without an entire page refresh if possible.

I compare this to something like the twitter main page when you're
logged in. You write up a post, click submit and it appears in the
live feed below.

Some areas where I'm fuzzy:

1. How do you (properly) go about encapsulating a 'main page' that
lists recent posts, and off to the side other things clearly not
associated with a 'post' model

2. How can you submit a form and have it do some processing on a model
unassociated with the view you're currently on? the action="controller/
method" will automatically redirect you to the view associated with
that controller method.

3. I assume AJAX is needed to have something reveal itself without
refresh.

I like cake, but am experiencing some growing pains until I figure out
how to accomplish my goals within the mold.

thanks,

Christian
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