You will likely be giving your Keynote presentation from a laptop. Using a laptop, you can easily rehearse your presentation at home or elsewhere as well as make last-minute changes. Apple currently sells MacBook Pro, PowerBook, and iBook laptops. Depending on your particular model, the steps for connecting an external monitor will vary. Here are the general steps for hooking up a laptop to a projector and giving a presentation.
A remote control lets you move away from the computer when presenting. There are several third-party remote controls that work with Keynote. Newer model Macs are shipping with the Apple Remote that can also be used to advance slides in a presentation.