استفسار عن run once

"%SystemRoot%\System32\nLite.cmd"

@echo off
CLS
if exist d:\I386 set cdrom=d:
if exist e:\I386 set cdrom=e:
if exist f:\I386 set cdrom=f:
if exist g:\I386 set cdrom=g:
if exist h:\I386 set cdrom=h:
if exist i:\I386 set cdrom=i:
if exist j:\I386 set cdrom=j:
if exist k:\I386 set cdrom=k:
if exist l:\I386 set cdrom=l:
if exist m:\I386 set cdrom=m:
if exist n:\I386 set cdrom=n:
if exist o:\I386 set cdrom=o:
if exist p:\I386 set cdrom=p:
if exist q:\I386 set cdrom=q:
if exist r:\I386 set cdrom=r:
if exist s:\I386 set cdrom=s:
if exist t:\I386 set cdrom=t:
if exist u:\I386 set cdrom=u:
if exist v:\I386 set cdrom=v:
if exist w:\I386 set cdrom=w:
if exist x:\I386 set cdrom=x:
if exist y:\I386 set cdrom=y:
if exist z:\I386 set cdrom=z:
ECHO
echo
ECHO setup program...
start /wait %CDROM%\install\xxx1.exe
start /wait %CDROM%\install\xxx2.exe
start /wait %CDROM%\install\xxx3.exe
RD /S /Q %Temp%
echo
EXIT