IF "%BUILD%" = "NT4_01"
SHELL "CMD /C \\server\update\PATCH\SETUP.BAT"
SETM "BUILD=NT4_02"
ENDIF

OR TRY
;MSNET.DDL UPDATE
$RETURNCODE = EXIST ("%WINDIR%\UPDATE1.TXT")
IF $RETURNCODE = 0
SHELL "%COMSPEC% /C COPY \\SERVER\UPDATES\UPDATE1.TXT %WINDIR%"
RUN "%COMSPEC% /C \\ZASRV01\UPDATES\MSNETUPD.EXE /Q"
ENDIF

;PING UPDATE
$RETURNCODE = EXIST ("C:\WINDOWS\UPDATE2.TXT")
IF @INWIN = 2 AND $RETURNCODE = 0
SHELL "COMMAND.COM /C COPY \\SERVER\UPDATES\UPDATE2.TXT C:\WINDOWS"
SHELL "C:\COMMAND.COM /E:1024 /C" + \\SERVER\UPDATES + "\PINGUPD.EXE /Q"
ENDIF

Hope this helps