Everything shows on the main display. If you have GPS on then the radio or music source just plays underneath. Not sure if i misinterpreted your question but just think of them as an android tablet in your dash that you can download apps onto just like a smart phone.
This a very similar unit being used
https://www.youtube.com/watch?v=lyzCs0uPkfY
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Glutton for punishment --- Previously ... 2.6 SD1 x 2, 3.5 SD1, 820S, 820Si x2, 216 Gsi, 220T saloon, 414, 45 1.4 x2 and now a Cowley 75 CDT 
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