If you are using kiXtart, just use the macros

SELECT ; Checks what OS you are running.
CASE ((@INWIN = 1) AND (@DOS = 5.0))
$OS = "Win2K"
CASE ((@INWIN = 1) AND (@DOS = 4.0))
IF $Systype = "LanmanNT" OR $SysType = "ServerNT"
$OS = NT4server
ELSE
$OS = "NT4wksta"
ENDIF
CASE ((@INWIN = 2) AND (@DOS >= 4.10))
$OS = "Win98"
CASE ((@INWIN = 2) AND (@DOS = 4.0))
$OS = "Win95"
ENDSELECT

Travis