Thank you for the reply!
There's a lot of info in it, and most interesting - for what I'm looking for - is the part about "Multitasking / viewing iRp and a PDF at the same time".
All this wil take time to digest, since my iPad skills aren't comfortable yet - iBooks eg isn't intuitive on how to open the PDF's.
After some hands-on help or YouTube demo I would understand better how Apple works, but for now I'm struggling with such basics.
I'll be back when somewhat more familiar with iOS.