I'm creating an instructional document with text and images. At certain places I'd like to have an explanation of why to do something. I don't want it there all the time--just when the user clicks on a link. I'm afraid to just link to another part of the document because the user might not find their way back.
Is this one of those really simple things or one of the "should-be-easy-but-is-actually-impossible" features?