Only the SLP key can do that and the product key is never requested during activation. The product key sticker attached to OEM computers, prior to Windows 8, will not activate the copy of windows supplied with the machine. It is most probable that an individual OEM royalty is much less than the retail price of the same version of Windows. Windows 8 will install on any UEFI motherboard containing a valid encrypted Microsoft product key since a royalty has been prepaid. Each manufacturer is issued with their own modified copy of Windows XP or Windows 7 that recognizes their own unique keys.
A royalty has been paid by the manufacturer if the board has a SLP key. Manufacturers are generally only given a few SLP keys by Microsoft. If the replacement board is the same brand and of the same broad vintage as the original, it will often be accepted by the OEM software.
Furthermore, because the check only involves the BIOS and not hardware, a user is allowed to change virtually all hardware components within the machine except motherboard, a procedure that would normally trigger re-activation in retail copies of Windows. In addition, if an end-user feels the need to perform a "clean install" of Windows and if the manufacturer supplies the user with an installation disc (not a "System Recovery" disc that is a hard-drive image), the user will not be prompted to activate the copy, given that the installation is performed on the same motherboard. This effectively "locks" the operating system to the qualified motherboard. SLP 2.0 to SLP 2.5 work in a similar manner. If the text string does not match the information stored in the particular installation's OEM BIOS files, the system prompts the user to activate their copy as normal. Operating systems that use SLP 1.0 check for a particular text-string in a computer's BIOS upon booting. SLP comes in eight different version which roughly coincide with versions of Windows NT.
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