Given a source and a sink for URLs, the next thing you need is pipe to buffer and modulate the connection. For this we use handheld devices, PDAs, cellphones, or someday watches. If we had a cooltown system deployed here I could have brought my talk as a URL carried in my watch and squirted in to your projector. That way I would have been able to travel without lugging this laptop. I could have squirted the URL for my talk into your watch so you could view it later or print copies for your friends.
For information on the software for moving URLs between devices checkout:
esquirt: universal remote control for e-services http://www.cooltown.com/dev/reference/coolbase/ds-esquirt.asp. Implementations for many platforms are available.