This is a string containing the manufacturer. Microsoft encourages system builders to put their name here, if theyre not a company, but you can put what you want.
A model number string for the computer, ie "Brendr I VTE-001-001 (w/ ASUSTek P5G41C-M)
Logo: A path to a BMP logo containing a manufacturer logo. It should be in 32-bit BMP format and should not exceed 120x120.
Hours you can expect to attain support for the system. Can be left blank if you don't provide support, but the key should be present.
A phone number which can be called and expect to receive support during the above hours. Can be left blank if you don't provide support, but the key should be present.
The manufacturer page for support. This can be any valid URI, such as mailto: if you want it to be email, however Microsoft suggests it be HTTP or HTTPS, ie, web pages.
An identifier for a product line, eg how Intel has the "Core" series processors.
Same as manufacturer above.
Full description of the product minus the manufacturer name. So for example if you have a HP Slimline w11858 or whatever (fudged model number there btw) then the SystemProductName would be "Slimline w11858"
The SKU for the item if applicable. It can be left blank however the key should be present.
Version number for this revision of the system.
Source and more information: http://forums.canadacomputers.com/showthread.php?tid=208