Multiple controllers simultaneously?

[eluser]Unknown[/eluser]
Let's say I have two controlles: 'news' and 'polls'.
On the page that displays news, I also want a box with a poll.,
Or let's say I always want a 'web_links' controller displayed on the bottom of every page?

Does CI have a procedure for this? Or MVC frameworks in general?

Should I instantiate two controllers? Or is there a preferable method?

Thanks in advance