A friend of mine conducts walking tours and gives presentations on Colonial Williamsburg and Virginia history. She wants to set up her presentations to use a laptop or notebook interfaced with a projector unit. Granted I've built my computer myself but I don't know much about computer-generated presentations. Do any of our SOH crewmembers have experience in this area? Since she needs to purchase both the laptop/notebook and the projector unit, what should she buy first and what features to look for?