SDI to MDI

Hi. I was wondering if anyone can provide some insight on how to convert an SDI application to an MDI application. This application was not written with the view->document architecture. It currently has a single bitmap background and would need to display a different bitmap for each individual document. It would also need to display data in 50 dialog boxes specific to the individual document. This information is currently downloaded and made global in the SDI application.

Any ideas would be greatly appreciated. Thanks again.