From: anton.txt@gmail.com   
      
   Herbert Kleebauer:   
      
   > > for  %%i in (*.txt) do call set list=%%list%%,%%i   
   >   
   > When  the  line is parsed, %% is replaced by %, so   
   > it becomes:   
   >   
   > call set list=%list%,%%i   
      
   That explains it, but what about the %%i?   I  never   
   understood  why  the  FOR  counter must be specified   
   with % on the command line and with %%  in  a  batch   
   file,  whereas other command (e.g. echo %PATH%) work   
   identically.  Again, the FOR documentation  communi-   
   cates the fact but gives no explanation.   
      
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