Sure you are, you've heard of Ajax, no?
All Ajax really does is make sure your browser doesn't sit around like a bump on a log quite as much as it's inclined to. (Don't get me wrong, I love Ajax, from both a user and a developer's perspective.)
"Any sufficiently advanced technology is indistinguishable from magic."
Kinda shows how painful the unadorned client-server arrangement can be, I guess.