Run Wordpress as another Yii module

I have read the Wiki available and I haven’t, read anything about running WordPress as a module.

What I want to do is add CMS capabilities as part of my Yii Web Application. So the user should, while logged on to the yii application, be able to create a blog etc etc and that would then be WordPress doing the work but without it being obvious.

Also I plan on using something like "Yii user" So is it possible that once logged in to the My site (Yii app) that if the user decides they want to post a blog that they dont have to log in again. in other words can WordPress recognize Yii sessions?

Also for them to use the same user DB?

I hope this question makes sense. Can anyone point me in the right direction.

thanks in advance.