Begriffserklärung Batchdatei

@echo off&CLS
set ClientsDone="\\c:\xxxxxxxxxxxxxxx\ClientsDone.txt"  
set ClientsAll="\\c:\xxxxxxxxxxxxxxxx\ClientsAll.txt"  
If not Exist %ClientsDone% Echo #%Date%#>%ClientsDone% 
For /f "Delims=" %%A in (    <<<<<<<<<<<<<<<<<<<<<<<<<<-- Warum wird hier ´Delims gebraucht und nicht tokens?  
   'Findstr /V /G:%ClientsDone% %ClientsAll%'  
     ) Do Call   : PingTest %%A
goto :EOF
:PingTest
set Client=%1
if defined MS set "MS="       <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<--Wozu brauch ich die Variable "MS"?  
for /F "tokens=3 delims==m^<" %%B in (      
  'ping -n 1 %Client% 2^>NUL ^|fine "TTL" ') do Set "MS=%%B"  <<<<<<<<<<<<<<<<<<<<<<<<<-- Komplette Zeile mysteriös  
if not defined MS @echo Client %Client% ist nicht erreichbar &goto :eof
xCOPY \\xxxxxxxxxxxxxxxxxxxxxxxx \\%ClientAll%\xxxxxxxxxxxxxxxxxxxxxxxxxx/y
(echo/%Client%)>>"%ClientsDone%"  
(echo/%Client% erledigt)