Are pages with HTML markup possible?

Hi, I'm still trying to change my application that is pure seaside to pier. I need to keep the layout of the page that means I need some control over the markup created. On the other hand I want to be able to "document" components that means to be able to put some text before and/or after the component. So imagine a page that contains three components. I want to do some specific markup for the layout of these components. And at the same time I want to be able to press edit and write some help text above component No. 2. Regarding layout I would need to do HTML markup. Can a pier page be enriched by HTML markup? Or is this possible by tweaking the environment? As far as I understand it the contents component in an environment determines the place in the tree where the page is rendered into. Can you have more than one in an environment? thanks, Norbert