multiple .blends in one game

I am trying to create a game where you and a friend can pick a character, and fight each other.

Now, I read here: http://wiki.blender.org/index.php/Bf-institute/ApricotBgeLogic that you can make multiple blends in one game.

I would of made it so, if you pick the character, an empty will make the character from another layer. I just can’t get the camera parented to the newley created object. So I am hoping to make all my characters in 1 blend file, and scenery in others.

Does anyone know how this process works? How do they do it in here?

Thanks

Download the Yo Frankie! demo from here http://www.yofrankie.org/ and see how its done. you need to use the ‘link and append’ feature under ‘File’ but look at the demo to see how it works in practice.