thx Gargoyle \:\)

It's very odd, Microsoft doesn't specify wich PID is what anywhere.
The database in the script is what I've gathered so far, to explain a bit further, the first 5 digits are:
The OS (for instance XP, 2K3 etc)
The Edition (Home, Professional, Enterprise, Standard etc.)
and Language, although I'm not sure about the language.

The last 3 digits are the PID type, for instance OEM, Retail and VLK.
The pid is on the cd as well in the \i386\setupp.ini (yes double pp's)
From there you system gets installed. You can change the last 3 digits in the setupp.ini, it will not change the type however but for instance changing OEM to 270 will make a VLK key valid instead of an OEM key when prompted for the key during the setup.

The first 5 digit's can't be changed, they are related to pidgen.dll and a number of other files. After researching this I found it interesting to find out how much different types there are hence why I wrote this UDF and ask you all to join. \:\)