and take your pick of information!
Here's one such result
"The term "1-2CPU" simply means Windows XP Professional can be installed on a computer having either one (1) or two (2) physical processors. Windows XP Home Edition can only be installed on a computer having just one (1) physical processor. Visit: click here and look under "Scalable processor support". "
for info on WinXP's setupp.ini click here