single pack, 3-pack?

[BigRoc]

Okay, I am going to buy XP Professional when I build my computer in the next month or so. My question is when I buy one that says single pack does it mean I can only use it once and then its no good any more or what?

http://www.newegg.com/Product/Product.asp?Item=N82E16837102069

 

[jdhore1]

basically...unless you bypass XP activation, you can only use it once on one computer