huh!? I know that you can use it up around to twenty times. Beyond that you have to call MS.
There is a provision for a company to buy just one disc and get multiple licensees. And they can use other discs if a disc had should get damaged.. The discs do not have the keys that can only be used with one individual disc. Somewhere I read that the discs are in groups. A disc will accept any key that is in its group. There could be thousands of keys in that group.
Does that answer your question?
Any disc from Dell will work on any product key from Dell, if the disc and product key are of the same issue.
Example: Dell sells 10,000 PCs all with Windows XP pro and all the PCs are part of that production run and the discs and key can interchange. Even if PC model numbs are different.