dos batch files

A batch file is nothing more than a sequence of dos shell commands. Windows XP and 2000 have slightly different command sets available in their dos shells. You should open a dos shell and type help to see what commands are available.

Hello
I am giving a batch file which was running correctly on windows xp but not in windows 2000. could you tell me the differences i should make. i need the same output in both of the operating systems.

@echo off
set __COMPAT_LAYER=Win2000
setLocal EnableDelayedExpansion

if EXIST %temp%\temp.dat del %temp%\temp.dat
if EXIST %temp%\temp1.dat del %temp%\temp1.dat
if EXIST %temp%\temp2.dat del %temp%\temp2.dat

set user=NAC_%username%.txt

set x=0
set n=0
set m=0
set y=0

for /f "tokens=* delims= " %%k in ('ipconfig /all') do (
set /a x+=1
call :start %%k
if !y!==3 goto continue
if !y!==3 exit /B
)
goto end

:continue
set /a x=x+3
set val=!x!
for /f "skip=%val% tokens=1,* delims=:" %%a in ('ipconfig /all') do (
set str=%%a
set str=!str: =!
if "!str:~0,11!"=="Description" (
set /a n+=1
set NA!n!=%%b
)
if "!str:~0,8!"=="Physical" (
set /a m+=1
set PA!m!=%%b
)
)

echo.
set i=1
set j=1

echo. Physical Address NAC Address>>%temp%\temp1.dat
echo. --------------------------------------------------------------------->>%temp%\temp1.dat

:loop0
if !i! LEQ !n! (

echo !NA%i%!>%temp%\temp2.dat
for %%a in (%temp%\temp2.dat) do set /a length=%%~za
set /a length -=2
del %temp%\temp2.dat
set l1=!length!

if !j! LEQ !m! (

set /a maxlen=53-!l1!
set len=0
set string1=!NA%i%!

:cont
if !len! LSS !maxlen! (
set string1=!string1! &rem
set /a len+=1
goto cont
)

set string2=!PA%j%!
set string2=!string2:-=!
set /a i+=1
set /a j+=1
)
set "string1=%string1% %string2%"
echo. !string1!>>%temp%\temp1.dat
echo.
goto loop0
)
for /f "tokens=* delims= " %%a in (%temp%\temp1.dat) do echo. %%a
echo.
echo. Do you Want to save the result
echo.
set /p choice=(y/n)
if %choice%==y goto save
if %choice%==Y goto save
goto stop

:save
for /f "tokens=* delims= " %%a in (%temp%\temp1.dat) do echo. %%a>>!user!
echo.
echo. File is saved with the name !user! in the current folder
echo.
pause
:stop
if EXIST %temp%\temp.dat del %temp%\temp.dat
if EXIST %temp%\temp1.dat del %temp%\temp1.dat
if EXIST %temp%\temp2.dat del %temp%\temp2.dat

goto end

:start
if (%1)==() set /a y+=1
goto end

:end