Connecting your laptop to the classroom technology is now accomplished through ONE provided USB cable, (with a tethered adapter, if needed) All connections (display, projector and internet connection) go through this single connection. Here's how to get connected.
Caveat: a small number of classrooms do not have an included computer don't have this "all powerful" single cable connection. Those classrooms provide a cable that connect to single technologies, like a Meeting OWL or wall-mounted display.
Did you catch the part about internet connection? This means that wi-fi may not be your friend -- on purpose.