Many pdf viewers have a note-taking option. If you download your camera manual pdf, you'll be able to add and organized notes anywhere in the manual. With my PDF Xchange viewer, for example, a note shows as a yellow bubble. When I hover the cursor over the bubble, my note is revealed.

Now that is cool!

What's not cool is when I clicked on your picture and then tried to close it out with the red "x" at the top right of the picture

That really is cool Rick.
I just downloaded the pdf. manual for my Nikon D40. I will have to give your above information a try.
I just tried it. What a great tool. Thank you so much.

Meanwhile, I have printed out the manual, and I am using a red marker pen to highlight some of the information. I am already loving this adventure.