Detecting Windows 2000 Server vs workstation

I've searched the newsgroup for this and didn't find anything.  I see
the codes for detecting the various versions of workstation operating
systems but I don't see how to distinguish between a Windows 2000 server
and workstation.

I'm sure it's either another code that no one has bothered including in
thri examples or possibly another field that has to be checked.

Can someone shed some light on this for me as I need to make this
distinction.

[Delphi 2005 Architect]

TIA

Scott