How many computers can be activated by the XP serial number on the chassis?

Tehran's bird asks:
Hello, I recently found out that there is a genuine XP serial number on my Lenovo computer case. I don't know if this serial number can still activate XP system. Is this a genuine system?
Many brand machines are affixed with the serial number of the genuine operating system. If XP, it can be used to activate other computers, but your serial number should be the XP Home version, the actual use value is not big, and now XP has It is an old system, and the number of cracked versions is inexhaustible, so don't worry too much. Here, let me say more, if it is the OEM serial number of Win7 computer, it can only be used on one computer, because it will bind the motherboard.