Search notes:

Registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ProductOptions

This key specifies which variant of Windows is booted.

ProductType

Value Windows edition
WinNt Windows client
LanmanNT Windows server - domain controller
ServerNT Windows server - server only
See also the functions

ProductSuite

This value contains a cached copy of the data in %SystemRoot%\System32\spp\store\2.0\tokens.dat

Index