For the first one, I'd like to be able to open nb attachments that students and colleagues send to me.
For the second, I agree that I can get the documentation from almost anywhere, but there is still a lag. I also find myself going back and forth between several doc pages. So, it would be nice to have an app that could:
a) do completions on the names of functions
b) create a recent history of visited pages
c) rapidly loading of links.
d) give me an option for dark background and light letters (I do much of my reading in the dark and prefer dark screens)
I would guess that a dedicated UI could be created that might be more streamlined than urls on a browser.
I think if I had something like this, I could use it as a "second-screen" to my laptop.