Your first step is to make sure you have an Intel-based Mac: any G4 or G5 Mac will not install Boot Camp and you won’t be able to dual boot into Windows XP. There’s been a lot written about Apple’s dramatic release of Boot Camp, a free download that lets you repartition your Intel-based Mac’s drive and install Windows XP as an alternative operating system, but even the magazine coverage I’ve seen doesn’t give you screen-by-screen details.