CI frontend, ExpressionEngine backend?

[eluser]ywftdg[/eluser]
I was curious, can I develop my frontend using CI and have my client manage the site using expression engine as the admin? This of course referring to the current version of expression engine. I know there is a new version coming soon, but even the current version works just great for my current project. If this is possible, how can I run expression engine with CI as my main framework?