From: jj4public@vfemail.net   
      
   I've just noticed that sometimes the CTRL-C is less effective some of my   
   batch files. So I isolated the problem and found out that somehow, CTRL-C   
   became less effective when the current code is in a grouped command(s).   
   Here's the minimal code to reproduce the problem.   
      
   My solution was to change the code so that it doesn't use any grouped   
   command whenever possible. But why does CTRL-C became less effective?   
      
   @echo off   
   echo press ctrl-c now   
   (   
     pause   
     echo ctrl-c failed   
   )   
      
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