Use gettype from the

gettype \[\\RemoteComputer\] \[/s\]

Where: \\RemoteComputer specifies an optional remote computer on which to run GetType.

/s specifies silent mode.

GetType will run on any 32-bit client and sets the error level (%ERRORLEVEL%) as follows:

Error level Meaning
1   Windows NT Workstation
2   Windows 2000 Professional
3   Windows NT Server Non-Domain Controller
4   Windows 2000 Server Non-Domain Controller
5   Windows NT Server Domain Controller
6   Windows 2000 Server Domain Controller
7   Windows NT \[Enterprise/Terminal\] Server Domain Controller
8   Windows NT \[Enterprise/Terminal\] Server Non-Domain Controller

Here is a code snipit you can include in your logon script:

set ERRORLEVEL=                               if "%OS%"=="Windows_NT" goto WINNT                               set ERRORLEVEL=9                               goto ERRL                               :WINNT                               %LogonServer%\netlogon\gettype.exe                               :ERRL                               set NTNUM=%ERRORLEVEL%                               goto T%ERRORLEVEL%                               :T9                              SET NTTYPE="Unknown"                               goto END                               :T8                              SET NTTYPE="Windows NT \[Enterprise/Terminal\] Server Non-Domain Controller"                               goto END                               :T7                              SET NTTYPE="Windows NT \[Enterprise/Terminal\] Server Domain Controller"                               goto END                               :T6                               SET NTTYPE="Windows 2000 Server Domain Controller"                               goto END                               :T5                               SET NTTYPE="Windows NT Server Domain Controller"                               goto END                               :T4                               SET NTTYPE="Windows 2000 Server Non-Domain Controller"                               goto END                               :T3                               SET NTTYPE="Windows NT Server Non-Domain Controller"                               goto END                               :T2                               SET NTTYPE="Windows 2000 Professional"                               goto END                               :T1                               SET NTTYPE="Windows NT Workstation"                               :END
The script returns two environment variables, NTNUM (%ERRORLEVEL%) and NTTYPE which you can use.