Remote Network Boot via PXE

Let's say you're responsible for a network of 100 computers shared by students. What do you do if one of those computers starts acting funny? If you're like me, you'll just do a clean install of the operating system. But that's a lot of work, especially if you have to do it several times a week. Fortunately, most PCs sold since 2001 follow the PC99 guidelines from Intel and Microsoft, which among other things says that new computers with Ethernet interfaces must implement two useful features: wake-on-LAN and network boot.