A client that I'm working with introduced me to this website (
www.join.me). We had been trying to communicate about a change he wanted in the drawings, and it wasn't really working. We both went to the website, downloaded an app (or something) and I was able to see his screen and cursor movements. We then flipped so he could see my screen. I had his plan open in Dcad. The truly amazing part (at least to me), was that he was able take control of my cursor and then draw in my drawing. With a few quick directions, he drew the line that explained what he was talking about! I haven't really investigated the site, so this should not be considered a strong recommendation - but the thing really worked. Apparently I used a free (and somehow limited) opportunity. I'm certain that you can get more from them if you pay.
I could be wrong, but this technology and computer thing might stick around for awhile.