Where are Reading Settings Stored?

I have a Glo and all my books are stored on the internal card. My wife has a touch, books stored internally as well. She sometimes wishes she could use my Glo at night (when I'm not reading of course lol). If I were to store her library on an external card (I can't try it as I don't have a micro SD card), would all the settings like what page she is on in each book or even shelves be carried over to the Glo and then back to her touch?

Hopefully I haven't made this sound too complicated!

Thanks