Well...
"The net connection" differs from venue to venue...
Last year, at the Silicon Valley Regional, I had a little access to the live Real Media feed to the internet...
San Jose State University has two dedicated OC-3 lines, practically none of which is typically taken up by student or official use (as far as I could see from the router statistics, which I conveniently happened to find [becoming friends with the network supervisor is a good thing
])
However, actually tapping into this connection would be rather difficult, either with or without authorization. Even more so would be to set up a server, running a webcam or what-have-you...
Though becoming even greater friends with a network supervisor could be a good thing...
/me ponders a great many things...
True Wireless Camera (none of that X-10 stuff) + Laptop + WAP + Hardline Connection + Ability to Run a Server = Great Fun...