Hi James;
You can use an SDI, MDI and/or MDMI application design style approach for any PB application. In my Web Apps I still use an MDI window to anchor the App within the browser. However on my Mobile Apps, I tend to use either SD or MDMI (Multiple Document Multiple Interface) to achieve the proper look. On the Web design approach I presented at the PB 2015 Conference, I demonstrated a cascade of MDI windows in my web App that adhered to the Canadian Government web standard know as CLF (Common Look & Feel) - which has now been extended to Mobile device as well. FYI: CLF.
I think the key focus now on App design should be on the desired look & feel that you are trying to achieve when your Apps are deployed to the target device(s) and the adherence to L&F standards you are also trying to also achieve.
Regards ... Chris
Your active involvement is much appreciated.
I believe this particular subject might make an excellent Webinar. I'd like to get some better ideas on moving away from a desktop MDI application toward and web-based and / or mobile solution. Finding out more about your approach for SDI / MDMI solutions would be extremely interesting.