Conducting a training seminar without projector What is the best way to conduct a training seminar inside a computer laboratory without a projector?

Is there an existing software program that could achieve the same results as conducting a training seminar with the aid of a projector?
Put your seminar material online, and just have people view it at the same time as you talk. It can be any easily readable format, like PDF file or simply series of web pages. If you are not sure that people will follow, just put large bold numbers on each page, and announce what page you're at when you change page. (A bit like kids' audio book!)

Either that, or hard copies of the material.