Yes, for the moment they are.

Win9x/ME uses the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
ProductName

And all version of WinNT up from 4.0, including Win2000 and XP (I have not used prior version of NT) use:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
ProductName

>Thanks for your response, Zlatin. Do you know if these registry key names are consistent across OS Versions? I would assume they are...
>
>-Irv.
>
>
>>
>>What about reading the registry
>>HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
>>ProductName
>>
>>-or-
>>
>>HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
>>ProductName
>>
>>Both should be checked
>>
>>HTH