The problem is that you need to communicate to a different program, the window manager, to direct that program to keep the window raised.
Then you have more control over the window e.g. With JFrame's setAlwaysOnTop(boolean). Some PDF displaying options are discussed here.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.