example for compaq laptop.
|1||Model Number (shown in area below the bar codes)||dv9095xx||The Model Number is unique to the hardware components, and is the most useful for finding drivers and support content.|
|2||Product Number (p/n)||RQ877AS||When using the Product Number to find a part or driver, enter only the letters and numbers before the # sign.|
|3||Product Name (Product)||HP Pavilion dv9000||The Product Name (also seen on the front of your notebook) is not useful, as there may be duplication across several PC models.|
source of this post:HP support