This process searches a network for code to boot. Instead of booting from code on the hard drive, or booting code from a CD, the PXE process can be what is used for booting up the computer. PXE (which I have heard pronounced as "PiXiE", by multiple people) is related to how the computer boots. To make all that happen, you need another computer on the network to send a magic Wake-on-LAN frame that will be recognized by the computer that supports WoL. Once the computer powers on, the computer will do what the computer always does whenever it powers on: the computer will boot. If that pattern was seen, then WoL would send a message to the system (perhaps to the intelligent ATX power supply, or the motherboard's WoL pins?) to have the system "wake up" more fully. If the network card was using Wake On LAN, then it would check incoming Ethernet frames for a particular pattern. It may seem like the computer is using no electricity because it is quiet because no fans are being used, but a tiny amount of electricity can be made available for some of the cards. These might have been made for providing some tiny amount of power or data communication. As I recall, older computers would sometimes use a separate (set of) wire(s) that connected to the network card. Computers that are "powered off" might actually use up a little bit of electricity, and be able to perform some very minor functions. Wake On LAN (WoL) is a feature that allows a computer to be powered on.
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