Can someone help me? This is the problem: I have a networkboot disk, when i use the disk for the first time on a computer, then the batchprogram must determine the macaddress, look if a file with the mac address of this computer already exist on a network share. If not exist, call format.bat and create a file with the mac address as name on the network share. If exist, goto unattended installation. I try several options in batch file but i cannot give de file the name of a variable. Much thanks to the person with a solution. GRT Example: (incorrect syntax) set preload=z: :getMac Get mac adress. ??? nbmac.exe > %macaddress% if not exist "%preload%.\winxp\boot\%macaddress%" goto Format call unattented.bat goto end :Format call format.bat REM Create file with macaddress name ??????? goto end :end ECHO Einde Atlantisguard

The easy part is creating the file. REM Creates 0-byte file with macaddress as name type nul > %macaddress% The hard part is getting the mac address into a variable. Maybe try nbmac.exe > result1.dat And then try example #39 here. Also look at #47. Good Luck P.S. I highly recommend looking at a more flexible scripting language such as AutoIt.